Shim kit includes 16 thin and 16 thick shims, which can be used to reduce lifter pre-load by 0.030" (thin shim), 0.060" (thick shim), or 0.090" (thin plus thick shim). Fits 302 and 351 pedestal style cylinder heads like Ford PerformanceM-6049-X306 ,M-6049-X307 andM-6049-X2.
