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Return To Shop12mm extreme duty pushrods for 1998.5–2018 24-valve 5.9L and 6.7L Cummins engines. Review the listed specifications and vehicle fitment to confirm the right match for your valvetrain.
Our 103 lb springs are the 24-valve option listed for builds up to 4,500 RPM. Tool steel retainers are sold separately. For higher-RPM competition use, review the 110 lb springs and their camshaft and tappet requirements.
These 1.45-inch tappets provide a larger contact face than the older 1.1-inch design and clear the 12-valve fuel pump eccentric. Check the engine years listed below and match the tappets to your camshaft; follow your cam’s oil and break-in requirements.
Extreme duty pushrods for 1989–1998 12-valve 5.9L Cummins engines. Review the listed specifications and vehicle fitment to confirm compatibility with your engine and valvetrain.
This 178/208 combo brings together the camshaft, heavy-duty pushrods, 103 lb valve springs and tappets for 1998.5–2018 24-valve Cummins engines. The grind is aimed at low-RPM response; installation still requires the clearance checks and break-in procedure below.
The 178/208 cast camshaft is intended for towing and low-RPM Cummins applications, with a listed operating range from idle to 4,000 RPM. Check the piston-to-valve clearance requirements for your engine before installation. Review the full cam specifications, break-in instructions and required supporting parts below.
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