Product Description
DLC-coated 1.45" billet tappets engineered for high RPM Cummins builds using 103–110# valve springs and aggressive cam profiles. The larger 1.45" face improves stability vs early 1.1" tappets and the DLC (diamond-like carbon) coating reduces friction and scuffing for long life in street/competition use.
Fitment
- 1989–2018 Dodge/Ram 2500 & 3500, 5.9L/6.7L Cummins (12V & 24V)
- Direct replacement when upgrading to performance cams and heavy seat-pressure springs
- Recommended with 103# springs for street/tow; 110# springs for high-RPM/competition
Why These Tappets
- 1.45" diameter face for improved lobe contact and stability
- DLC coating for reduced wear and lower friction
- Pairs perfectly with Hamilton cams and 24V spring/retainer upgrades
Cross-Reference / Alternatives
- Hamilton 1.45" Cast Tappets (budget alternative): 07-T-001
- Hamilton 188/220 Cast Cam (street/tow): 07-C-188-220
- Hamilton 188/220 Steel Cam (higher spring pressures): 07-C-188/220S
- Hamilton Bolt-On Cam Retainer (gear control): 07-C-002
Recommended Supporting Parts
- Hamilton 103# Valve Springs (street/tow): 07-S-003
- Hamilton 110# Competition Springs (6,500 RPM capability): 07-S-110
- Hamilton Steel Tool Retainers (required with higher RPM): 07-S-004
- Hamilton 12mm Extreme Duty Pushrods (24V 98.5–18): 07-P-004
FAQ
Do I need DLC-coated tappets for my build?DLC adds wear protection and reduces friction—especially helpful with high spring pressures, steep cam ramps, frequent towing, or sustained high RPM.
What springs should I pair with these tappets?For most street/tow 24V builds, use Hamilton 103# springs. For frequent 4,500+ RPM or big cam lift, step up to 110# springs with steel tool retainers.
Will these fit my 12-valve 5.9L?Yes—these 1.45" lifters are designed to clear the fuel pump eccentric on 12V engines and work across 1989–1998 12V and 1998.5–2018 24V applications.
Should I upgrade my cam at the same time?It’s smart to match the cam, springs, pushrods, and tappets. For tow-focused trucks, consider the 188/220 cast cam; for higher RPM/pressure, the steel 188/220.
Break-in and oil recommendations?Use high-zinc break-in oil for the first 500 miles and follow your cam manufacturer’s procedure. Recheck lash after break-in.
