{"title":"RAM, (2019-2024) 6.7L Cummins, Engine, Valve Train","description":"\u003cdiv class=\"sds-copy-intro\"\u003e\u003cp\u003eValve springs, pushrods, rocker hardware, valve stem seals and a lifter conversion kit for the 2019-2024 Ram 2500 and 3500 with the 6.7L Cummins. The one thing every owner should know: the factory hydraulic roller lifters are this generation's main internal weak point, and a cold-start tick that does not fade is the warning sign.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv class=\"sds-copy-guide\"\u003e\n\u003ch2\u003eThe valve train on the 2019-2024 RAM 6.7L Cummins\u003c\/h2\u003e\n\u003cp\u003eFor 2019, hydraulic roller lifters went into the 6.7L \u003ca href=\"\/collections\/cummins\"\u003eCummins\u003c\/a\u003e, a first for any Cummins. They ride on a hollow billet-steel camshaft in the block and work non-adjustable rocker arms, with stiffer valve springs and new exhaust valves up top. The upside is maintenance: there is no 150,000-mile valve-lash service on this engine. The downside is the lifter itself, which became the generation's main internal failure.\u003c\/p\u003e\n\u003ch2\u003eWhat fails and why\u003c\/h2\u003e\n\u003cp\u003eThe factory lifters have no needle bearings, run tight tolerances with undersized oil passages, and use a pressed steel alignment dowel that can back out. When a roller collapses or seizes, it gouges the cam and sends metal through the oil. The signs are a typewriter-like tick on cold start that does not fade, metal in the oil and a misfire. It hits both standard and high output engines across 2019-2024. Some have failed inside the first 10,000 miles, and an engine past 100,000 miles without noise is considered high mileage for this design. Oil grade plays into it: a Ram TSB rules out 15W-40 on these engines because the thicker oil fails to pressurize the lifters when cold. Out of warranty, the dealer answer is a replacement engine.\u003c\/p\u003e\n\u003ch2\u003eStock replacement vs. upgrade\u003c\/h2\u003e\n\u003cp\u003eThe aftermarket answers the lifter problem two ways. Solid-lifter conversions use lifter spacers, new pushrods and adjustable rockers to remove the hydraulic section of the factory lifter. Flat-tappet conversions go further: the Hamilton Cams kit uses DLC tappets, a new 178\/208 camshaft and adjustable rockers. The Hamilton kit is the conversion in this collection. It changes the camshaft, and no CARB EO is documented for either type of conversion, so check your local requirements before you buy. On the stock side, you will find MAHLE valve stem seals and the genuine Cummins rocker box gasket. For owners building the top end, XDP adds HD high-boost valve springs, performance springs and retainers, billet valve bridges, an HD rocker arm trunnion set and street performance pushrods made for 2019-2024.\u003c\/p\u003e\n\u003ch2\u003eWhat we carry\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/collections\/hamilton-cams\"\u003eHamilton Cams\u003c\/a\u003e: 07-cc-24v19+ flat tappet conversion for the 2019-2024 6.7L Cummins.\u003c\/li\u003e\n\u003cli\u003eXDP: XD390 HD high boost valve spring set, XD313 performance valve springs and retainer set, XD318 HD billet rocker arm valve bridge set, XD319 HD rocker arm trunnion set with polishing tool, and XD399 street performance 3\/8-inch pushrods for 2019-2024.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/collections\/mahle\"\u003eMAHLE\u003c\/a\u003e: SS45962 valve stem seal kit.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/collections\/cummins-genuine-parts\"\u003eCummins\u003c\/a\u003e: 3963379 genuine rocker box gasket.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment notes\u003c\/h2\u003e\n\u003cp\u003eThe Hamilton conversion and the XD399 pushrods are made for 2019-2024. The XDP springs, trunnions and valve bridges are listed for 1998.5-2024, but the 2019 engine moved to hydraulic lifters and non-adjustable rockers, so call us to confirm how they pair with your setup, stock or converted. Know whether your engine is standard output (sales code ETL) or high output (ETM), and check the build sheet rather than a VIN digit. Lifter work can be done in the frame, but it takes magnets to hold the lifters up while the cam comes out and a trough in the cam tunnel, and if a lifter drops, the oil pan has to come off. These parts should not be assumed to fit a 2025 engine. Verify by VIN or use the fitment checker.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eWhat does a failing lifter sound like on a 2019-2024 6.7L Cummins?\u003c\/h3\u003e\n\u003cp\u003eA typewriter-like tick on a cold start that does not fade as the engine warms up. Other signs are metal in the oil and a misfire. Oil analysis 500 to 1,000 miles before each oil change is the recommended way to catch lifter metal early.\u003c\/p\u003e\n\u003ch3\u003eWhat does the Hamilton flat-tappet conversion change?\u003c\/h3\u003e\n\u003cp\u003eIt replaces the factory hydraulic roller setup with DLC tappets, a new 178\/208 camshaft and adjustable rockers. Because it includes a cam, plan it as a full top-end and cam job, and no CARB EO is documented for it. Talk to us about parts and installation before you commit.\u003c\/p\u003e\n\u003ch3\u003eCan the lifters be replaced without pulling the engine?\u003c\/h3\u003e\n\u003cp\u003eYes, in the frame, but it takes the right tools. Magnets hold the lifters up while the cam is pulled, and a trough goes in the cam tunnel. If a lifter drops, the oil pan comes off, so have a pan gasket on hand before you start.\u003c\/p\u003e\n\u003ch3\u003eDoes oil grade really matter for the lifters?\u003c\/h3\u003e\n\u003cp\u003eYes. A Ram TSB says 15W-40 is not to be used in 2019 and newer engines because the thicker oil fails to pressurize the lifters when cold. Run 10W-30 CK-4 above 0 F or 5W-40 full synthetic, and shorten intervals if you tow or idle a lot.\u003c\/p\u003e\n\u003cp class=\"sds-copy-cta\"\u003eNot sure what fits? Call the shop at the number in the header, or use the fitment checker on any product page. We install everything we sell.\u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"hamilton-cams-19-flat-tappet-conversion","title":"Hamilton Cams 07-cc-24v19+ Flat Tappet Conversion (2019-2024 6.7L Cummins)","description":"\u003cdiv class=\"sds-pd-intro\"\u003e\u003cp\u003eThe Hamilton Cams 07-cc-24v19+ Flat Tappet Conversion replaces the factory hydraulic roller lifters and camshaft in a 2019-2024 Ram 2500 or 3500 with the 6.7L Cummins. In their place you get a 178\/208 forged steel cam, DLC-coated steel tappets, upgraded pushrods and adjustable rocker arms. Owners buy it to get rid of the lifter design that can wipe out a cam.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv class=\"sds-pd-body\"\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eBuilt for 2019-2024 Ram 2500 and 3500 pickups with the 6.7L \u003ca href=\"\/collections\/cummins\"\u003eCummins\u003c\/a\u003e. Hamilton Cams states the kit fits and is emission certified for all 2019-2024 Ram 2500 and 3500 diesels not in California. Hamilton does not do business in California, so the kit is not offered for California trucks. The lifter design it replaces is shared by the standard-output and high-output engines, and the kit is listed for both the 2500 and the 3500.\u003c\/p\u003e\n\u003cp\u003eIt is not listed for the 2025 and newer 6.7L. That engine has a redesigned block and head, and 2019-2024 engine parts should not be assumed to fit it. Our catalog tag reads 2019-current, but the kit's listed range is 2019-2024, so verify fitment by VIN. If your engine block or cylinder head has been surfaced, call before ordering so the kit can be verified for proper fitment.\u003c\/p\u003e\n\u003ch2\u003eWhy this part\u003c\/h2\u003e\n\u003cp\u003eThe hydraulic roller lifters in the 2019-2024 6.7L are the known weak spot of this engine. They have no needle bearings, run tight tolerances with undersized oil passages, and use a pressed steel alignment dowel that can back out. When a roller collapses or seizes, it gouges the camshaft and seeds the oil with metal. Watch for a typewriter-like tick on cold start that does not fade, metal in the oil, or a misfire. Some engines have shown it within the first 10,000 miles.\u003c\/p\u003e\n\u003cp\u003ePutting new factory-style lifters back in leaves you with the same design. This kit changes the design instead. Hamilton Cams calls the factory hydraulic roller lifters and camshaft problematic and converts the engine to a flat tappet setup: a forged cam, DLC-coated tappets, stiffer pushrods and adjustable rockers with DLC-coated trunnions. Valve lash is set at the adjustable rockers, and the kit is certified for street use in 49 states.\u003c\/p\u003e\n\u003ch2\u003eWhat you get\u003c\/h2\u003e\n\u003cp\u003eHamilton Cams lists the kit contents as:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e178\/208 Forged camshaft\u003c\/li\u003e\n\u003cli\u003eDLC coated steel tappets\u003c\/li\u003e\n\u003cli\u003eUpgraded pushrods\u003c\/li\u003e\n\u003cli\u003eAdjustable rocker arms with DLC coated trunnions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eForged steel camshaft\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTighter Grain Structure: Hamilton's 178-208 steel cams are forged, not cut from bar stock, resulting in a more dense, more uniform grain structure.\u003c\/li\u003e\n\u003cli\u003eEnhanced Longevity: A natural “halo” in grain structure forms on the exterior of the cam during forging, adding a layer of strength for extended service life.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eDLC-coated tappets\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGas Carburized \u0026amp; Polished: Each tappet goes through a hardening process that gives it the hardness to act as a very stable base metal for the DLC coating.\u003c\/li\u003e\n\u003cli\u003eDiamond-Like Carbon (DLC) Coating: A very hard surface finish that reduces friction and wear. The installation notes below cover the oil, lash and rpm limits that protect it.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eHeavy-duty pushrods\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e3500+ lbs Buckling Force: Compared to around 1800 lbs for OEM pushrods, these reduce deflection at high cylinder pressures.\u003c\/li\u003e\n\u003cli\u003eConsistent Valve Timing: With less flex, the valvetrain stays in sync under hard use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eUpgraded rocker arms\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCasting: Built to handle intense stress and heat cycles.\u003c\/li\u003e\n\u003cli\u003eGas Carburized Ball \u0026amp; Foot: Reduces friction and wear for longer service intervals.\u003c\/li\u003e\n\u003cli\u003eDLC-Coated Trunnion: Minimizes galling, a common issue with OEM trunnions, and lowers overall friction in the valvetrain.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003ePart number: 07-cc-24v19+\u003c\/li\u003e\n\u003cli\u003eCamshaft: 178\/208, forged steel\u003c\/li\u003e\n\u003cli\u003eTappets: DLC-coated steel, gas carburized and polished\u003c\/li\u003e\n\u003cli\u003ePushrods: 3500+ lbs buckling force (OEM around 1800 lbs)\u003c\/li\u003e\n\u003cli\u003eRocker arms: adjustable, gas carburized ball and foot, DLC-coated trunnion\u003c\/li\u003e\n\u003cli\u003eIntake Valve Lash: 0.010″\u003c\/li\u003e\n\u003cli\u003eExhaust Valve Lash: 0.020″\u003c\/li\u003e\n\u003cli\u003eCertification: 49-state, SEMA-certified for street use; not for California\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation notes\u003c\/h2\u003e\n\u003cp\u003eSet lash to Hamilton's spec: intake 0.010″, exhaust 0.020″. Lash that is too loose increases the impact when the lash goes to solid and can damage the tappets or the coating, so make sure your lash is correct.\u003c\/p\u003e\n\u003cp\u003eOil matters more with flat tappets than with rollers. The factory oil for the stock 2019-2024 engine is 10W-30 or 5W-40 CK-4. With this kit in the engine, Hamilton Cams recommends:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eValvoline 15W-40 Premium Blue\u003c\/li\u003e\n\u003cli\u003eSchaeffer 700 Series 15W-40\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eHere is why. Thin viscosity oils do not provide the hydrodynamic wedge a flat tappet needs, and oils low in zinc, phosphorus and molybdenum do not carry the additive package it needs. DLC lowers friction and extends part life, but incorrect oil, incorrect lash or valve float can damage it. High rpm amplifies the impact of the camshaft on the tappet, and Hamilton discourages high spring pressures and high rpm for longevity. When viscosity is too low, lash is too loose or rpm is too high, the oil film is not strong enough to keep the tappet and cam apart. The DLC then degrades into graphite and starts to decompose and delaminate.\u003c\/p\u003e\n\u003cp\u003ePlan this as cam-out engine work. On this engine, changing lifters in the frame means holding the lifters up with magnets while the cam is pulled and working through a trough in the cam tunnel. If a lifter drops, the oil pan has to come off. If you would rather not take that on, call the shop.\u003c\/p\u003e\n\u003ch2\u003eAbout Hamilton Cams\u003c\/h2\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/hamilton-cams\"\u003eHamilton Cams\u003c\/a\u003e builds valvetrain and top-end parts for the 5.9L and 6.7L Cummins out of Lampasas, Texas. The line is built around two cam profiles, the milder 178\/208 and the bigger 188\/220, sold bare or as complete combos for 12-valve and 24-valve engines, along with head gaskets, gasket kits and forged valve bridges. Hamilton says its cams are backed by decades of research, thousands of dyno tests and millions of real-world miles.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eWill this kit fit my 2025 Ram 2500 or 3500?\u003c\/h3\u003e\n\u003cp\u003eIt is not listed for 2025 trucks. The kit is listed for 2019-2024 Ram 2500 and 3500 diesels. The 2025 and newer 6.7L has a redesigned block and head, and 2019-2024 engine parts should not be assumed to fit it.\u003c\/p\u003e\n\u003ch3\u003eCan I keep running 10W-30 after the conversion?\u003c\/h3\u003e\n\u003cp\u003eHamilton Cams recommends Valvoline 15W-40 Premium Blue or Schaeffer 700 Series 15W-40 with this kit. Thin oils do not hold the film a flat tappet needs, and low-zinc oils lack the additives. The wrong oil can break down the DLC coating on the tappets.\u003c\/p\u003e\n\u003ch3\u003eIs the kit legal for street use?\u003c\/h3\u003e\n\u003cp\u003eHamilton Cams states it is 49-state certified, SEMA-certified for street use in 49 states, and emission certified for 2019-2024 Ram 2500 and 3500 diesels outside California. Hamilton does not sell it for California trucks.\u003c\/p\u003e\n\u003cp class=\"sds-pd-cta\"\u003eQuestions on fitment? Call the shop at the number in the header. We install everything we sell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Hamilton Cams","offers":[{"title":"Default Title","offer_id":50818002944288,"sku":"07-cc-24v19+","price":3399.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0916\/3043\/6640\/files\/hamilton-cams-07-cc-24v19-19-flat-tappet-conversion-2636157.png?v=1779545715"},{"product_id":"mahle-ss45962-valve-stem-seal-kit-2007-5-2024-cummins","title":"MAHLE SS45962 Valve Stem Seal Kit (2007.5-2024 6.7L Cummins)","description":"\u003cdiv\u003eMade from OE-quality materials, the MAHLE SS45962 Valve Stem Seal Kit provides your Dodge 6.7L Diesel with stock performance. The Valve Stem Seal Kit is made to OE specifications and is a direct factory replacement.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch5\u003e\u003cspan\u003eFeatures:\u003c\/span\u003e\u003c\/h5\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003eOE Quality \u003c\/li\u003e\n\u003cli\u003eMaintains a Factory Performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eApplication Notes:\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003eContains 12. \u003c\/div\u003e\n\u003cdiv\u003ePosition: Intake \u0026amp; Exhaust. \u003c\/div\u003e\n\u003cdiv\u003e2 kits required per truck. \u003c\/div\u003e\n\u003cdiv\u003eMetal molded with rubber. \u003c\/div\u003e\n\u003cdiv\u003eTop hat seal.\u003c\/div\u003e","brand":"Mahle","offers":[{"title":"Default Title","offer_id":51155581272352,"sku":"SS45962","price":15.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0916\/3043\/6640\/files\/mahle-ss45962-valve-stem-seal-kit-20075-2024-cummins-7258951.jpg?v=1779543728"},{"product_id":"cummins-3963379-genuine-rocker-box-gasket-2003-2024-5-9-6-7l-cummins","title":"Cummins 3963379 Genuine Rocker Box Gasket (2003-2024 5.9\/6.7L Cummins)","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eEnsure that the rocker box on your 5.9L and 6.7L diesel is properly sealed with the Cummins 3963379 Genuine Rocker Box Gasket. The rocker box gasket is a genuine OEM component and provides a perfect fit and seal. This gasket goes underneath the rocker box and seals the rocker box to the cylinder head. \u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch5\u003eFeatures:\u003c\/h5\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003eDirect-Fit Replacement\u003c\/li\u003e\n\u003cli\u003eSeals Rocker Box To Cylinder Head\u003c\/li\u003e\n\u003cli\u003eMaintains Factory Fit \u0026amp; Function\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Cummins","offers":[{"title":"Default Title","offer_id":52253607428384,"sku":"3963379","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0916\/3043\/6640\/files\/cummins-3963379-genuine-rocker-box-gasket-2003-2024-5967l-cummins-4002676.jpg?v=1787892434"}],"url":"https:\/\/www.southerndieselsupply.com\/collections\/ram-2019-2024-6-7l-cummins-engine-valve-train.oembed","provider":"Southern Diesel Supply","version":"1.0","type":"link"}