The KPMI® Rocker Shim Conversion Spring Kit for the Milwaukee-8 utilizes the proven KPMI 0.625" beehive spring and a lightweight retainer that houses a standard Ø9.5mm hardened steel shim. The rocker arm rides directly on the shim surface and the 9.5mm 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 6mm valve stem. 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.
IMPORTANT NOTE:
Modification Necessary: To maximize shim contact in the retainer, KPMI recommends “tipping” (shortening the valve tip). See KPMI® installation instructions for more info.
Stem Protrusion: There is anticipated to be a rough 0.100” increase in effective stem protrusion with the use of the shim.
