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Wednesday 20 July 2022


M-8 Race .675" Lift Rocker Shim Conversion System

This KPMI rocker shim conversion spring kit for the M-8 utilizes a dual spring system and a lightweight retainer that houses a standard 9.5 mm hardened steel shim. 

The rocker arm rides directly on the shim surface and the 9.5 mm diameter significantly increases the allowable rocker wipe area. This increase in wipe area provides the ability to utilize larger lift cams, that previously were unable to run on a 6 mm valve stem.

The system is intended to be adjustable and allows for at least 0.060" of spring shims, tailoring the pressures and lift capacity to meet the engine builder's needs. Additionally, the rocker shim thickness can be varied to adjust effective stem protrusion.
When larger camshafts are used, and valvetrain acceleration values increase, KPMI strongly recommends running titanium valves for maximum performance. See KPMI's installation instructions for more information.