Comp Cams 1.640 SPRING SHIM KIT Build Better Studio RS 1969 Pontiac Firebird 350

RS 1969 Pontiac Firebird 350 HO

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Provides optimal protection for the urea tank with minimal clearance loss

Comp Cams 1.640 SPRING SHIM KIT Build Better Studio RS 1969 Pontiac Firebird 350Spring Shim Kit: 1. 640" O. D., . 635" . 650" I. D. This shim kit contains . 015", . 030" and . 060" thick Valve Spring Shims with 1. 640" outside diameter and . 635" . 650" inside diameter are used to equalize the installed height of valve springs. Made from the highest quality shim stock, these shims are heat treated to stand up to radical cam lobes. Kits are also available.