6.7L Cummins Flat Tappet Conversion Kit With 178/208 Camshaft | Hamilton Cams 07-CC-24V25-2

Convert a 2025–2026 6.7 Cummins off the factory hydraulic-roller valvetrain before a stuck roller takes out a cam lobe. Hamilton Cams 07-CC-24V25-2 is a matched flat-tappet kit with a forged 178/208 efficiency cam, DLC-coated steel tappets, heavy-duty pushrods, and adjustable rockers with DLC-coated trunnions. It returns the engine to the same architecture that ran from 1989 through 2018. Built for stock and mild trucks that stay on OEM springs and under about 4,000 rpm. 49-state / SEMA certified. Not legal for sale or use in California.

Key features

• Complete flat-tappet conversion for 2025–2026 6.7 Cummins
• Forged 178/208 efficiency camshaft, not cut from bar stock
• DLC-coated, gas-carburized steel flat tappets
• Heavy-duty pushrods, about 3,500+ lb buckling force versus about 1,800 lb OEM
• Adjustable rocker arms with DLC-coated trunnions
• Helps eliminate roller-lifter debris and lobe-wipe failures
• Quicker spool, sharper throttle, and lower EGTs on many stock trucks
• Works with factory tuning and emissions equipment outside California
• SEMA certified for 49-state street use

Fitment

• 2025–2026 Ram 2500 / 3500 6.7L Cummins
• Also used on 2025–2026 Ram 4500 / 5500 6.7L Cummins applications that share this valvetrain

Call Hamilton if the block or cylinder head has been surfaced.

What’s in the box

• Forged 178/208 camshaft
• DLC-coated steel flat tappets
• Heavy-duty pushrods
• Adjustable rocker arms with DLC-coated trunnions

Valve springs, head gasket, and cam-removal tray are sold separately.

Notes & specs

• Brand/part number: Hamilton Cams 07-CC-24V25-2
• Also listed as: 07-CC-24V25+
• Engine: 6.7L Cummins
• Cam profile: 178 intake / 208 exhaust at 0.050 in.
• Intended use: stock and mild towing / daily driving
• Valve springs: OEM springs for this kit
• Intake valve lash: 0.010 in.
• Exhaust valve lash: 0.020 in.
• Recommended oil: Valvoline Premium Blue 15W-40 or Schaeffer 700 Series 15W-40
• Winter oil: Valvoline Premium Blue 5W-40 or Schaeffer 5W-40
• Recommended filter: Fleetguard Stratapore LF16035
• Emissions: 49-state / SEMA certified

Set lash after five minutes of run time and check it again after the head is retorqued. Wrong oil or dirty splash oil will damage the DLC coating. If a 2025–2026 6.7 Cummins is still on factory hydraulic rollers, the Hamilton 07-CC-24V25-2 flat-tappet kit with the 178/208 cam is the matched valvetrain conversion built to replace them.