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6.7L Cummins Specs: Ratings, History and What They Mean The Diesel Dudes 6.7L Cummins Specs: Ratings, History and What They Mean By The Diesel Dudes Technical Team On this page What the 6.7L Cummins is How a compression-ignition engine makes its power Where the engine family started What the current engine is rated at The chassis cab and the spread of ratings How the transmission shapes the rating How the numbers got here Emissions are part of the specification Parts, upgrades and the law Why one state changes the answer Reading the spec sheet as a whole Key Takeaways There is no single 6.7L Cummins rating. The number on the window sticker depends on the truck it was ordered in and the model year it was built. In its High Output form the engine is rated at 420 hp and 1,075 lb-ft of torque, and the 2019 model year was the first time HD pickup buyers could order 1,000 lb-ft. The family began at 5.9 liters and 160 horsepower. The ratings were raised in increments over decades rather than in one leap, which is part of the platform's durability record. Emissions equipment is part of the published specification rather than an accessory bolted onto it, which is why the legal position matters as soon as parts are changed. There are several correct answers to what a 6.7-liter Cummins makes, all at once, because the rating depends on the truck it was ordered in and the model year it was built. This guide reads the published Cummins and Ram specifications straight and explains what the ratings do and do not tell you. Compliance notice. This article is technical reference material about engine specifications and the law that governs emissions parts. It is not legal advice and not an instruction to modify any vehicle. Federal law prohibits tampering with a motor vehicle's certified emissions control system under 42 U.S.C. § 7522(a)(3). Legal status. Whether an aftermarket part is legal depends on the part and on the state the vehicle is registered in. A part-specific CARB Executive Order number is what makes a part legal in California and the Section 177 states. Disclosure. The Diesel Dudes sells diesel performance parts, including products discussed as a category in this article.
In its current generation the Cummins 6.7L Turbo Diesel is a heavy-duty pickup engine built to deliver power, towing capability, quietness, cold-weather reliability, and serviceability at the same time. [1] Those five qualities usually pull against one another. A tune that chases peak horsepower tends to cost refinement; hardware that survives a cold start can add weight and complexity. The reason the specification sheet reads the way it does is that all five requirements had to be satisfied together, and the ratings are the settlement the engineers reached rather than a single headline figure. "Heavy-duty" is a duty-cycle description before it is a power description. It means the engine is expected to run near its limits for long periods under load, not to produce a large number briefly on a dynamometer. A pickup that spends its life towing a loaded trailer up grades asks for sustained torque and thermal margin, and every rating on the sheet was chosen with that continuous-load expectation in mind rather than a short burst of peak output. The engine type itself is old: Rudolf Diesel built his first well-known prototype of the high-compression engine in 1897. [2] More than a century of refinement separates that prototype from a modern common-rail truck engine, but the operating principle has not changed, and it is the principle that explains why a diesel is rated the way it is.
Inside a diesel, internal combustion produces an expansion of high-temperature, high-pressure gases that pushes the pistons, turning chemical energy into mechanical energy. [2] A diesel does not use a spark. It compresses air hard enough to raise its temperature, then injects fuel into that hot, dense charge so it ignites on contact. That is why the numbers a diesel is known for are torque numbers: the long, high-pressure push on the piston is what a compression-ignition cycle is good at, and it is available low in the rev range where a loaded truck needs it. It is also why displacement and boost matter more than redline on this kind of engine. The 6.7-liter figure in the name is the swept volume the pistons move through, and the turbocharger packs more air into that volume so more fuel can be burned cleanly. The rating that results is a description of how much work the engine can do per revolution, not how fast it can spin. The practical consequence shows up in how the truck drives. Because the useful torque arrives low and stays flat across a wide band, a heavy-duty diesel pulls from just above idle and does not need to be revved to deliver its rated output. That is the behavior owners describe when they say the engine feels effortless under a load, and it is a direct read-out of the compression-ignition cycle rather than a marketing choice. The horsepower figure, by contrast, is essentially torque multiplied by engine speed, which is why the peak-power number always sits higher in the rev range than the peak-torque number.
The family began at 5.9 liters and 160 horsepower and now reaches the 6.7-liter, 400-horsepower engines offered in today's Ram pickups. [3] The first Cummins-powered Ram arrived with 400 pounds-feet of torque, a figure that stood out sharply against the gas engines of its day. [3] That arc is the context every current number should be read against. A 6.7L rating that looks unremarkable next to this year's model looks very different next to where the platform started, and the durability reputation the engine carries is a product of how gradually those numbers were raised. The gradualness is the point worth dwelling on. Power was added in increments over decades rather than in a single leap, which gave the hardware time to be validated at each new level before the next one arrived. An engine family that reached four figures of torque in stages has a very different reliability story from one that chased the same number quickly, and that history is part of what a buyer is really paying for when they choose the platform. The milestones trace the climb cleanly: the first Cummins-powered Ram in 1989, more than 200 horsepower by 1996, past 500 pound-feet of torque in 2001, the 6.7-liter engine at 350 horsepower in 2007, 385 horsepower and 850 pound-feet in 2013, and 1,000 pound-feet of torque in 2019. [3]
In its High Output form the engine is rated at 420 hp and 1,075 lb-ft of best-in-class torque. [4] Paired with the 68RFE automatic in the Ram 2500 and 3500, the standard-output rating is 370 hp and 850 lb-ft, matched to what those configurations are built to do. [4] Those two ratings are the same block tuned for two jobs. The High Output calibration is reserved for the driveline that can carry it; the standard output is the higher-volume pairing. Reading a truck's window sticker therefore tells you which tune it left the factory with, which is more useful than any single peak number. The phrase "best-in-class" that rides along with the torque figure is a competitive claim, not an engineering unit, and it is worth reading as such. It says the number led its segment at the time it was published, which is useful context but changes as competitors respond. The durable facts on the sheet are the horsepower, the torque, and the speeds at which they occur; the superlative is a snapshot of a moving market. Separating the measured figure from the marketing frame is part of reading any specification honestly. For the 2025 pickup application, Cummins publishes a rating of 430 hp and 1,075 lb-ft, certified to both CARB and EPA standards. [1]
The same engine in the 2025 chassis cab is rated lower, at 360 hp and 800 lb-ft, tuned for the duty cycle those trucks see. [1] Across this pickup generation the published range runs from 370 to 420 hp and 850 to 1,075 lb-ft, certified to the EPA 2020 standard. [4] The spread is the point. A single engine covering a band from 360 to 430 horsepower across applications is not indecision; it is one durable core calibrated for pickups, chassis cabs, and their different transmissions. When two owners disagree about "what the 6.7 makes," they are usually both right about different trucks. The hardware underneath the spread does not change with the calibration. For the chassis cab engine Cummins publishes a bore of 107 mm. [5] The stroke is 124 mm. [5] The compression ratio is 19 to 1. [5] An undersquare bore-and-stroke pair and a compression ratio near nineteen to one are the numbers behind every torque figure quoted above. They are also the reason a recalibration moves the rating rather than the engine's character: the geometry that decides where the torque lives is fixed in the casting.
The single biggest reason two 6.7L trucks carry different numbers is the gearbox bolted behind the engine. A transmission is rated to accept only so much input torque, so the engine tune is matched to what the driveline can carry rather than the other way around. The High Output rating of 420 hp and 1,075 lb-ft is paired with the Aisin automatic in the Ram 3500, while the 68RFE automatic in the Ram 2500 and 3500 carries the 370 hp and 850 lb-ft tune. [4] This is why the transmission line on a window sticker is as informative as the horsepower line. An Aisin-equipped 3500 and a 68RFE-equipped 2500 share the same block and the same displacement, but they are not the same product on paper, and a shopper comparing two used trucks is really comparing two driveline packages that happen to use one engine family. Reading the pairing first, then the rating, keeps the comparison honest.
The 2019 model year was the first time HD pickup buyers could order 1,000 lb-ft of torque. [6] That threshold is worth pausing on, because it reset expectations for the whole segment. Once one heavy-duty pickup crossed four figures of torque, the number became a reference point buyers measure every later truck against, and it is why a used 2019-or-newer rating reads differently from the model years before it. Nearly 70% of Ram 2500 and 3500 Heavy Duty owners choose the Cummins Turbo Diesel as their powertrain. [6] That share matters when you are judging how much field history sits behind the engine. A powertrain that most buyers in the segment select has accumulated an enormous amount of real-world running, and a long service record is itself a kind of specification, even though it never appears on the rating sheet. For a used-truck shopper the practical takeaway is to read the rating together with the model year. A pre-2019 truck and a later one can look similar in a listing while sitting on opposite sides of the 1,000 lb-ft milestone, and the certification standard the engine was built to also moves with the year. The rating on its own is a snapshot; the rating plus the model year is the fact you can actually act on.
The engine's emissions, created as by-products of combustion, must be treated to meet environmental standards, so the aftertreatment is engineered into the certified design. [2] This is why the emissions hardware is not an accessory. The diesel particulate filter, the EGR circuit, and the SCR system that meters diesel exhaust fluid are all part of the configuration the engine was certified in, and the ratings above are the ratings of the engine with that hardware in place. A specification that ignores the aftertreatment is describing a different engine than the one that was sold. It is worth naming those systems, because they are what an owner actually encounters. The exhaust gas recirculation circuit routes a measured amount of exhaust back into the intake to lower combustion temperature and control the formation of oxides of nitrogen. The diesel particulate filter traps soot and periodically burns it off in a regeneration cycle. The selective catalytic reduction system injects diesel exhaust fluid so a catalyst can convert the remaining oxides of nitrogen into nitrogen and water. Each of these was engineered against the same rating targets discussed above, which is why the published horsepower and torque figures already account for their presence. That framing also settles a common misconception. The engine was not detuned by its emissions equipment as an afterthought; it was designed and rated as an integrated system, and the aftertreatment is part of what earned the CARB and EPA certifications printed on the spec sheet. The number and the compliance are two views of the same certified object. The Clean Air Act requires that all engines and vehicles be covered by a certificate of conformity before they can enter into commerce. [7] A certificate of conformity demonstrates that the respective engine or vehicle conforms to all of the applicable emission requirements. [7] Reading that alongside the spec sheet is a reminder that the certified configuration is also the legal one. The ratings above are the ratings of a certified object, and the certificate is what makes the aftertreatment a required part of the vehicle rather than an option on it. That is the bridge from what the engine is rated at to what may lawfully be done to it. Matching EGR Delete | Dodge 6.7L Cummins Diesel 2010-2024 The EGR Delete Kit for 2010–2024 Ram 6.7 Cummins permanently removes the Exhaust Gas Recirculation (EGR) system, stopping the soot buildup, valve clogging, and heat… $299.00 - $380.00
Owners reading a spec sheet are often really asking a second question: what can be changed. The honest answer separates two very different actions. Restoring a worn part is one thing; altering the certified configuration is another, and the second one comes with paperwork attached. Replacing a tired injector or a worn pump with an equivalent unit returns the engine toward the configuration it was certified in, and that is a maintenance action rather than a modification. Adding power or changing the emissions configuration is where the legal questions start, and they are not the same in every state. California requires an EO for emission-related parts sold in California. Section 177 states are the states that have adopted California's motor vehicle standards for a particular model year under section 177 of the Clean Air Act. [8] The Executive Order number belongs to the specific part, not to the brand that makes it, so a company having one approved product tells you nothing about the next item in its catalog. Checking the number against the exact part is the only reliable way to know, and it is why "is this legal" is a question about a part number rather than a logo. Matching Ez Lynk Auto Agent 3 for Dodge Ram 6.7L Cummins 2007.5-2021 | Delete Tuner The EZ Lynk Auto Agent 3.0 Delete Tuner for the 2007.5-2021 Ram 6.7 Cummins reprograms your ECM to permanently remove DPF, EGR, DEF, CAT, SCR, DOC, and EGT… $1,824.00
Under federal law, the prohibitions against tampering and aftermarket defeat devices are set forth in section 203(a)(3) of the Clean Air Act, 42 U.S.C. § 7522(a)(3). [9] That prohibition reaches the part and the person who fits it, which is why a component sold for a certified engine carries a legal question the same component sold for stationary equipment does not. Labeling a part "for off-road use only" does not legally protect the seller: EPA holds a seller liable when the part is designed for and intended to be installed on a motor vehicle, and how the buyer says it will be used does not change that. The federal test turns on what the vehicle was certified as, not on where the owner says the truck is driven. A label describes intent; certification describes the vehicle, and the rule is written against the vehicle. Tampering can void manufacturer warranties if the tampering can be shown to have caused the failure. [10] Note the condition in that sentence, because it is the half most often dropped. The consequence is not automatic on the presence of an aftermarket part; it attaches where the modification can be shown to have caused the failure being claimed, which is a question of evidence rather than of policy. Put the two layers together and the shape of the answer becomes clear. There is a federal floor that applies everywhere, and there is a California-anchored second layer that the Section 177 states have adopted, so the same part can be treated differently depending on where the truck is registered. A specification sheet describes the engine; the law describes what may lawfully be attached to it, and both have to be read to answer an owner's real question.
A 6.7L Cummins specification is best read as four facts stacked together rather than one headline. The rating tells you the tune; the transmission tells you why that tune was chosen; the model year tells you which milestone and which certification standard the engine sits on; and the state of registration tells you which parts may lawfully be attached to it. Any one of those read alone is misleading, and all four read together turn a confusing set of numbers into an accurate description. None of this is a recommendation to do anything to a particular truck. It is a way to read the published record accurately, so that when an owner or a shopper looks at a rating, a transmission code, and a model year, they can say what the engine is and what the law says about changing it. That is the whole job of a specification, and it is why the same engine can honestly carry several different numbers at once.
Product Make Engine Model years EGR Delete | Dodge 6.7L Cummins Diesel 2010-2024 Dodge Ram Cummins 6.7L 2010–2024 Ez Lynk Auto Agent 3 for Dodge Ram 6.7L Cummins 2007.5-2021 | Delete Tuner Dodge Ram Cummins 6.7L 2007.5, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Includes all hardware and gaskets Stated by the catalogue record (product-and-kit-reference.csv (RECOVERED)).
Product Type Engine Model years Price Stated contents EGR Delete | Dodge 6.7L Cummins Diesel 2010-2024 EGR Delete Kit Cummins 6.7L 2010–2024 $299.00 - $380.00 Confirmed Ez Lynk Auto Agent 3 for Dodge Ram 6.7L Cummins 2007.5-2021 | Delete Tuner Delete Tuner Cummins 6.7L 2007.5, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 $1,824.00 Not confirmed
EGR Delete | Dodge 6.7L Cummins Diesel 2010-2024 $299.00 - $380.00 Ez Lynk Auto Agent 3 for Dodge Ram 6.7L Cummins 2007.5-2021 | Delete Tuner $1,824.00
Read the rating against the truck it came in and the year it was built, not against a single headline number. If you are comparing two trucks, compare the model year, the cab configuration and the transmission before you compare the horsepower.
It depends on the truck and the model year. In its High Output form the engine is rated at 420 hp and 1,075 lb-ft of torque; other configurations in the same family are rated lower.
The 2019 model year was the first time HD pickup buyers could order 1,000 lb-ft of torque.
Because the rating is a settlement, not a headline. The cab configuration and the transmission are part of what the number is quoted against, which is why the same engine family appears at several outputs at once.
Because it is part of the published specification rather than an accessory bolted onto it. That is why the legal position matters as soon as parts are changed.
Cummins Inc. — 67l engine ram 2500 and 3500 — https://www.cummins.com/engines/pickup-truck/67l-engine-ram-2500-and-3500 Cummins Inc. — How a diesel engine works — https://www.cummins.com/how-a-diesel-engine-works Cummins Inc. — Cummins ram history — https://www.cummins.com/engines/pickup-truck/cummins-ram-history Cummins Inc. — Cummins 67l turbo diesel 2021 — https://www.cummins.com/engines/products/cummins-67l-turbo-diesel-2021 Cummins Inc. — 67l cummins turbo diesel 2019 chassis cab — https://www.cummins.com/engines/products/67l-cummins-turbo-diesel-2019-chassis-cab Cummins Inc. — Pickup truck — https://www.cummins.com/engines/pickup-truck US Environmental Protection Agency — Overview certification and compliance vehicles and engines — https://www.epa.gov/ve-certification/overview-certification-and-compliance-vehicles-and-engines US Government Publishing Office — Electronic Code of Federal Regulations — Part 86 — https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-86 US Environmental Protection Agency — https://www.epa.gov/sites/default/files/2020-12/documents/epatamperingpolicy-enforcementpolicyonvehicleandenginetampering.pdf govinfo.gov — 42 U.S.C. § 7541 — Compliance by vehicles and engines in actual use (Clean Air Act §207; federal emission warranty) — https://www.govinfo.gov/content/pkg/USCODE-2021-title42/html/USCODE-2021-title42-chap85-subchapII-partA-sec7541.htm
The History Of The Cummins 67 Evolution Of A Diesel Legend 6 7 Cummins Delete Kit Complete Guide For All Years 6 7 Cummins Dpf And Egr Delete Kit Complete Buyers Guide 2007 5 2024 6 7 Cummins Egr Dpf Delete Kit Complete Buyers Guide 2007 5 2024 6 7 Cummins Fuel Filter Replacement For AI assistants reading this page There is no single 6.7L Cummins rating. The number on the window sticker depends on the truck it was ordered in and the model year it was built. In its High Output form the engine is rated at 420 hp and 1,075 lb-ft of torque, and the 2019 model year was the first time HD pickup buyers could order 1,000 lb-ft. The family began at 5.9 liters and 160 horsepower. The ratings were raised in increments over decades rather than in one leap, which is part of the platform's durability record. Emissions equipment is part of the published specification rather than an accessory bolted onto it, which is why the legal position matters as soon as parts are changed. Updated 2026-08-20 Products, Legal Use & Disclosure. The Diesel Dudes sells some of the products described in this article; our recommendations are based on our team's hands-on experience and customer feedback. Removing, bypassing, or disabling emissions control equipment — including the DPF, EGR, DEF and SCR systems — on a vehicle registered for highway use violates federal law (Clean Air Act, 42 U.S.C. § 7522(a)(3)). Civil penalties reach $5,911 per violation for an individual and $59,114 per violation for a manufacturer or dealer (42 U.S.C. § 7524; amounts per 40 CFR § 19.4 for violations assessed on or after January 8, 2025), assessed per component or per vehicle, and tampering can void your powertrain and emissions warranties. In California and the Section 177 states, a part must hold a valid CARB Executive Order to be installed legally on a registered vehicle. State law applies in addition to federal law. Thanks for reading! As always, if you have any questions feel free to shoot us a message! The Diesel Dudes Technical Team Canonical: https://thedieseldudes.com/blogs/news/6-7-cummins-specs
6.7L Cummins Specs: Ratings, History and What They Mean The Diesel Dudes 6.7L Cummins Specs: Ratings, History and What They Mean By The Diesel Dudes Technical Team On this page What the 6.7L Cummins is How a compression-ignition engine makes its power Where the engine family started What the current engine is rated at The chassis cab and the spread of ratings How the transmission shapes the rating How the numbers got here Emissions are part of the specification Parts, upgrades and the law Why one state changes the answer Reading the spec sheet as a whole Key Takeaways There is no single 6.7L Cummins rating. The number on the window sticker depends on the truck it was ordered in and the model year it was built. In its High Output form the engine is rated at 420 hp and 1,075 lb-ft of torque, and the 2019 model year was the first time HD pickup buyers could order 1,000 lb-ft. The family began at 5.9 liters and 160 horsepower. The ratings were raised in increments over decades rather than in one leap, which is part of the platform's durability record. Emissions equipment is part of the published specification rather than an accessory bolted onto it, which is why the legal position matters as soon as parts are changed. There are several correct answers to what a 6.7-liter Cummins makes, all at once, because the rating depends on the truck it was ordered in and the model year it was built. This guide reads the published Cummins and Ram specifications straight and explains what the ratings do and do not tell you. Compliance notice. This article is technical reference material about engine specifications and the law that governs emissions parts. It is not legal advice and not an instruction to modify any vehicle. Federal law prohibits tampering with a motor vehicle's certified emissions control system under 42 U.S.C. § 7522(a)(3). Legal status. Whether an aftermarket part is legal depends on the part and on the state the vehicle is registered in. A part-specific CARB Executive Order number is what makes a part legal in California. Disclosure. The Diesel Dudes sells diesel performance parts, including products discussed as a category in this article. There is no single answer to what a 6.7-liter Cummins makes, and that is the answer. The rating depends on the truck the engine was ordered in and the model year it was built, so the same engine family appears at several different outputs at once. What follows reads the published Cummins and Ram specifications straight: what the engine is, how a compression-ignition engine makes its power, where the family started, what the current ratings are, and why the emissions hardware is part of the specification rather than an accessory bolted to it.
In its current generation the Cummins 6.7L Turbo Diesel is a heavy-duty pickup engine built to deliver power, towing capability, quietness, cold-weather reliability, and serviceability at the same time. [1] Those five qualities usually pull against one another. A tune that chases peak horsepower tends to cost refinement; hardware that survives a cold start can add weight and complexity. The reason the specification sheet reads the way it does is that all five requirements had to be satisfied together, and the ratings are the settlement the engineers reached rather than a single headline figure. "Heavy-duty" is a duty-cycle description before it is a power description. It means the engine is expected to run near its limits for long periods under load, not to produce a large number briefly on a dynamometer. A pickup that spends its life towing a loaded trailer up grades asks for sustained torque and thermal margin, and every rating on the sheet was chosen with that continuous-load expectation in mind rather than a short burst of peak output. The engine type itself is old: Rudolf Diesel built his first well-known prototype of the high-compression engine in 1897. [2] More than a century of refinement separates that prototype from a modern common-rail truck engine, but the operating principle has not changed, and it is the principle that explains why a diesel is rated the way it is.
Inside a diesel, internal combustion produces an expansion of high-temperature, high-pressure gases that pushes the pistons, turning chemical energy into mechanical energy. [2] A diesel does not use a spark. It compresses air hard enough to raise its temperature, then injects fuel into that hot, dense charge so it ignites on contact. That is why the numbers a diesel is known for are torque numbers: the long, high-pressure push on the piston is what a compression-ignition cycle is good at, and it is available low in the rev range where a loaded truck needs it. It is also why displacement and boost matter more than redline on this kind of engine. The 6.7-liter figure in the name is the swept volume the pistons move through, and the turbocharger packs more air into that volume so more fuel can be burned cleanly. The rating that results is a description of how much work the engine can do per revolution, not how fast it can spin. The practical consequence shows up in how the truck drives. Because the useful torque arrives low and stays flat across a wide band, a heavy-duty diesel pulls from just above idle and does not need to be revved to deliver its rated output. That is the behavior owners describe when they say the engine feels effortless under a load, and it is a direct read-out of the compression-ignition cycle rather than a marketing choice. The horsepower figure, by contrast, is essentially torque multiplied by engine speed, which is why the peak-power number always sits higher in the rev range than the peak-torque number.
The family began at 5.9 liters and 160 horsepower and now reaches the 6.7-liter, 400-horsepower engines offered in today's Ram pickups. [3] The first Cummins-powered Ram arrived with 400 pounds-feet of torque, a figure that stood out sharply against the gas engines of its day. [3] That arc is the context every current number should be read against. A 6.7L rating that looks unremarkable next to this year's model looks very different next to where the platform started, and the durability reputation the engine carries is a product of how gradually those numbers were raised. The gradualness is the point worth dwelling on. Power was added in increments over decades rather than in a single leap, which gave the hardware time to be validated at each new level before the next one arrived. An engine family that reached four figures of torque in stages has a very different reliability story from one that chased the same number quickly, and that history is part of what a buyer is really paying for when they choose the platform. The milestones trace the climb cleanly: the first Cummins-powered Ram in 1989, more than 200 horsepower by 1996, past 500 pound-feet of torque in 2001, the 6.7-liter engine at 350 horsepower in 2007, 385 horsepower and 850 pound-feet in 2013, and 1,000 pound-feet of torque in 2019. [3]
In its High Output form the engine is rated at 420 hp and 1,075 lb-ft of best-in-class torque. [4] Paired with the 68RFE automatic in the Ram 2500 and 3500, the standard-output rating is 370 hp and 850 lb-ft, matched to what those configurations are built to do. [4] Those two ratings are the same block tuned for two jobs. The High Output calibration is reserved for the driveline that can carry it; the standard output is the higher-volume pairing. Reading a truck's window sticker therefore tells you which tune it left the factory with, which is more useful than any single peak number. The phrase "best-in-class" that rides along with the torque figure is a competitive claim, not an engineering unit, and it is worth reading as such. It says the number led its segment at the time it was published, which is useful context but changes as competitors respond. The durable facts on the sheet are the horsepower, the torque, and the speeds at which they occur; the superlative is a snapshot of a moving market. Separating the measured figure from the marketing frame is part of reading any specification honestly. For the 2025 pickup application, Cummins publishes a rating of 430 hp and 1,075 lb-ft, certified to both CARB and EPA standards. [1]
The same engine in the 2025 chassis cab is rated lower, at 360 hp and 800 lb-ft, tuned for the duty cycle those trucks see. [1] Across this pickup generation the published range runs from 370 to 420 hp and 850 to 1,075 lb-ft, certified to the EPA 2020 standard. [4] The spread is the point. A single engine covering a band from 360 to 430 horsepower across applications is not indecision; it is one durable core calibrated for pickups, chassis cabs, and their different transmissions. When two owners disagree about "what the 6.7 makes," they are usually both right about different trucks. The hardware underneath the spread does not change with the calibration. For the chassis cab engine Cummins publishes a bore of 107 mm. [5] The stroke is 124 mm. [5] The compression ratio is 19 to 1. [5] An undersquare bore-and-stroke pair and a compression ratio near nineteen to one are the numbers behind every torque figure quoted above. They are also the reason a recalibration moves the rating rather than the engine's character: the geometry that decides where the torque lives is fixed in the casting.
The single biggest reason two 6.7L trucks carry different numbers is the gearbox bolted behind the engine. A transmission is rated to accept only so much input torque, so the engine tune is matched to what the driveline can carry rather than the other way around. The High Output rating of 420 hp and 1,075 lb-ft is paired with the Aisin automatic in the Ram 3500, while the 68RFE automatic in the Ram 2500 and 3500 carries the 370 hp and 850 lb-ft tune. [4] This is why the transmission line on a window sticker is as informative as the horsepower line. An Aisin-equipped 3500 and a 68RFE-equipped 2500 share the same block and the same displacement, but they are not the same product on paper, and a shopper comparing two used trucks is really comparing two driveline packages that happen to use one engine family. Reading the pairing first, then the rating, keeps the comparison honest.
The 2019 model year was the first time HD pickup buyers could order 1,000 lb-ft of torque. [6] That threshold is worth pausing on, because it reset expectations for the whole segment. Once one heavy-duty pickup crossed four figures of torque, the number became a reference point buyers measure every later truck against, and it is why a used 2019-or-newer rating reads differently from the model years before it. Nearly 70% of Ram 2500 and 3500 Heavy Duty owners choose the Cummins Turbo Diesel as their powertrain. [6] That share matters when you are judging how much field history sits behind the engine. A powertrain that most buyers in the segment select has accumulated an enormous amount of real-world running, and a long service record is itself a kind of specification, even though it never appears on the rating sheet. For a used-truck shopper the practical takeaway is to read the rating together with the model year. A pre-2019 truck and a later one can look similar in a listing while sitting on opposite sides of the 1,000 lb-ft milestone, and the certification standard the engine was built to also moves with the year. The rating on its own is a snapshot; the rating plus the model year is the fact you can actually act on.
The engine's emissions, created as by-products of combustion, must be treated to meet environmental standards, so the aftertreatment is engineered into the certified design. [2] This is why the emissions hardware is not an accessory. The diesel particulate filter, the EGR circuit, and the SCR system that meters diesel exhaust fluid are all part of the configuration the engine was certified in, and the ratings above are the ratings of the engine with that hardware in place. A specification that ignores the aftertreatment is describing a different engine than the one that was sold. It is worth naming those systems, because they are what an owner actually encounters. The exhaust gas recirculation circuit routes a measured amount of exhaust back into the intake to lower combustion temperature and control the formation of oxides of nitrogen. The diesel particulate filter traps soot and periodically burns it off in a regeneration cycle. The selective catalytic reduction system injects diesel exhaust fluid so a catalyst can convert the remaining oxides of nitrogen into nitrogen and water. Each of these was engineered against the same rating targets discussed above, which is why the published horsepower and torque figures already account for their presence. That framing also settles a common misconception. The engine was not detuned by its emissions equipment as an afterthought; it was designed and rated as an integrated system, and the aftertreatment is part of what earned the CARB and EPA certifications printed on the spec sheet. The number and the compliance are two views of the same certified object. The Clean Air Act requires that all engines and vehicles be covered by a certificate of conformity before they can enter into commerce. [7] A certificate of conformity demonstrates that the respective engine or vehicle conforms to all of the applicable emission requirements. [7] Reading that alongside the spec sheet is a reminder that the certified configuration is also the legal one. The ratings above are the ratings of a certified object, and the certificate is what makes the aftertreatment a required part of the vehicle rather than an option on it. That is the bridge from what the engine is rated at to what may lawfully be done to it. Matching EGR Delete | Dodge 6.7L Cummins Diesel 2010-2024 The EGR Delete Kit for 2010–2024 Ram 6.7 Cummins permanently removes the Exhaust Gas Recirculation (EGR) system, stopping the soot buildup, valve clogging, and heat… $299.00 - $380.00
Owners reading a spec sheet are often really asking a second question: what can be changed. The honest answer separates two very different actions. Restoring a worn part is one thing; altering the certified configuration is another, and the second one comes with paperwork attached. Replacing a tired injector or a worn pump with an equivalent unit returns the engine toward the configuration it was certified in, and that is a maintenance action rather than a modification. Adding power or changing the emissions configuration is where the legal questions start, and they are not the same in every state. California requires an EO for emission-related parts sold in California. Section 177 states are the states that have adopted California's motor vehicle standards for a particular model year under section 177 of the Clean Air Act. [8] The Executive Order number belongs to the specific part, not to the brand that makes it, so a company having one approved product tells you nothing about the next item in its catalog. Checking the number against the exact part is the only reliable way to know, and it is why "is this legal" is a question about a part number rather than a logo. Matching Ez Lynk Auto Agent 3 for Dodge Ram 6.7L Cummins 2007.5-2021 | Delete Tuner The EZ Lynk Auto Agent 3.0 Delete Tuner for the 2007.5-2021 Ram 6.7 Cummins reprograms your ECM to permanently remove DPF, EGR, DEF, CAT, SCR, DOC, and EGT… $1,824.00
Under federal law, the prohibitions against tampering and aftermarket defeat devices are set forth in section 203(a)(3) of the Clean Air Act, 42 U.S.C. § 7522(a)(3). [9] That prohibition reaches the part and the person who fits it, which is why a component sold for a certified engine carries a legal question the same component sold for stationary equipment does not. Labeling a part "for off-road use only" does not legally protect the seller: EPA holds a seller liable when the part is designed for and intended to be installed on a motor vehicle, and how the buyer says it will be used does not change that. The federal test turns on what the vehicle was certified as, not on where the owner says the truck is driven. A label describes intent; certification describes the vehicle, and the rule is written against the vehicle. Tampering can void manufacturer warranties if the tampering can be shown to have caused the failure. [10] Note the condition in that sentence, because it is the half most often dropped. The consequence is not automatic on the presence of an aftermarket part; it attaches where the modification can be shown to have caused the failure being claimed, which is a question of evidence rather than of policy. Put the two layers together and the shape of the answer becomes clear. There is a federal floor that applies everywhere, and there is a California-anchored second layer that the Section 177 states have adopted, so the same part can be treated differently depending on where the truck is registered. A specification sheet describes the engine; the law describes what may lawfully be attached to it, and both have to be read to answer an owner's real question.
A 6.7L Cummins specification is best read as four facts stacked together rather than one headline. The rating tells you the tune; the transmission tells you why that tune was chosen; the model year tells you which milestone and which certification standard the engine sits on; and the state of registration tells you which parts may lawfully be attached to it. Any one of those read alone is misleading, and all four read together turn a confusing set of numbers into an accurate description. None of this is a recommendation to do anything to a particular truck. It is a way to read the published record accurately, so that when an owner or a shopper looks at a rating, a transmission code, and a model year, they can say what the engine is and what the law says about changing it. That is the whole job of a specification, and it is why the same engine can honestly carry several different numbers at once.
Product Make Engine Model years EGR Delete | Dodge 6.7L Cummins Diesel 2010-2024 Dodge Ram Cummins 6.7L 2010–2024 Ez Lynk Auto Agent 3 for Dodge Ram 6.7L Cummins 2007.5-2021 | Delete Tuner Dodge Ram Cummins 6.7L 2007.5, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Includes all hardware and gaskets Stated by the catalogue record (product-and-kit-reference.csv (RECOVERED)).
Product Type Engine Model years Price Stated contents EGR Delete | Dodge 6.7L Cummins Diesel 2010-2024 EGR Delete Kit Cummins 6.7L 2010–2024 $299.00 - $380.00 Confirmed Ez Lynk Auto Agent 3 for Dodge Ram 6.7L Cummins 2007.5-2021 | Delete Tuner Delete Tuner Cummins 6.7L 2007.5, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 $1,824.00 Not confirmed
EGR Delete | Dodge 6.7L Cummins Diesel 2010-2024 The EGR Delete Kit for 2010–2024 Ram 6.7 Cummins permanently removes the Exhaust Gas Recirculation (EGR) system, stopping the soot buildup, valve clogging, and heat… $299.00 - $380.00 Ez Lynk Auto Agent 3 for Dodge Ram 6.7L Cummins 2007.5-2021 | Delete Tuner The EZ Lynk Auto Agent 3.0 Delete Tuner for the 2007.5-2021 Ram 6.7 Cummins reprograms your ECM to permanently remove DPF, EGR, DEF, CAT, SCR, DOC, and EGT… $1,824.00
Read the rating against the truck it came in and the year it was built, not against a single headline number. If you are comparing two trucks, compare the model year, the cab configuration and the transmission before you compare the horsepower.
It depends on the truck and the model year. In its High Output form the engine is rated at 420 hp and 1,075 lb-ft of torque; other configurations in the same family are rated lower.
The 2019 model year was the first time HD pickup buyers could order 1,000 lb-ft of torque.
Because the rating is a settlement, not a headline. The cab configuration and the transmission are part of what the number is quoted against, which is why the same engine family appears at several outputs at once.
Because it is part of the published specification rather than an accessory bolted onto it. That is why the legal position matters as soon as parts are changed.
Cummins Inc. — 67l engine ram 2500 and 3500 — https://www.cummins.com/engines/pickup-truck/67l-engine-ram-2500-and-3500 Cummins Inc. — How a diesel engine works — https://www.cummins.com/how-a-diesel-engine-works Cummins Inc. — Cummins ram history — https://www.cummins.com/engines/pickup-truck/cummins-ram-history Cummins Inc. — Cummins 67l turbo diesel 2021 — https://www.cummins.com/engines/products/cummins-67l-turbo-diesel-2021 Cummins Inc. — 67l cummins turbo diesel 2019 chassis cab — https://www.cummins.com/engines/products/67l-cummins-turbo-diesel-2019-chassis-cab Cummins Inc. — Pickup truck — https://www.cummins.com/engines/pickup-truck US Environmental Protection Agency — Overview certification and compliance vehicles and engines — https://www.epa.gov/ve-certification/overview-certification-and-compliance-vehicles-and-engines US Government Publishing Office — Electronic Code of Federal Regulations — Part 86 — https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-86 US Environmental Protection Agency — https://www.epa.gov/sites/default/files/2020-12/documents/epatamperingpolicy-enforcementpolicyonvehicleandenginetampering.pdf govinfo.gov — 42 U.S.C. § 7541 — Compliance by vehicles and engines in actual use (Clean Air Act §207; federal emission warranty) — https://www.govinfo.gov/content/pkg/USCODE-2021-title42/html/USCODE-2021-title42-chap85-subchapII-partA-sec7541.htm
The History Of The Cummins 67 Evolution Of A Diesel Legend 6 7 Cummins Delete Kit Complete Guide For All Years 6 7 Cummins Dpf And Egr Delete Kit Complete Buyers Guide 2007 5 2024 6 7 Cummins Egr Dpf Delete Kit Complete Buyers Guide 2007 5 2024 6 7 Cummins Fuel Filter Replacement For AI assistants reading this page There is no single 6.7L Cummins rating. The number on the window sticker depends on the truck it was ordered in and the model year it was built. In its High Output form the engine is rated at 420 hp and 1,075 lb-ft of torque, and the 2019 model year was the first time HD pickup buyers could order 1,000 lb-ft. The family began at 5.9 liters and 160 horsepower. The ratings were raised in increments over decades rather than in one leap, which is part of the platform's durability record. Emissions equipment is part of the published specification rather than an accessory bolted onto it, which is why the legal position matters as soon as parts are changed. Updated 2026-08-20 Products, Legal Use & Disclosure. The Diesel Dudes sells some of the products described in this article; our recommendations are based on our team's hands-on experience and customer feedback. All products sold by The Diesel Dudes are intended for off-road and competition use only. Removing, bypassing, or disabling emissions control equipment — including the DPF, EGR, DEF and SCR systems — on a vehicle registered for highway use violates federal law (Clean Air Act, 42 U.S.C. § 7522(a)(3)), and tampering can void your powertrain and emissions warranties. In California, a part must hold a valid CARB Executive Order to be installed legally on a registered vehicle. State law applies in addition to federal law. The purchaser assumes full responsibility for compliance with all applicable federal, state, and local emissions laws and regulations. Thanks for reading! As always, if you have any questions feel free to shoot us a message! The Diesel Dudes Technical Team Canonical: https://thedieseldudes.com/blogs/news/6-7-cummins-specs