Comp Cams 1.550 Spring Seat Cups HLN Diesel Heaters Perfect for racing or daily

Perfect for racing or daily driving application

Base 1980 - 1982 GMC K2500 Sierra Grande 1994 - 1995 GMC K2500 Sierra SL

Custom 1978 - 1981 Buick Century Sport

• Hand washable

Why order a Stages package

Comp Cams 1.550 Spring Seat Cups HLN Diesel Heaters Perfect for racing or dailySpring Locator Cups: . 060" Thick, . 640" I. D., 1. 670" O. D. The old standard shims will not hold up to the extreme spring pressures and high RPM in today's race engines. COMP Cams offers a simple but effective solution to this problem. These Valve Spring Locators provide a thin, hardened steel alloy seat that will not only protect the head and shim, but also locate and hold the spring in place. Previously, this part has been available only in a cup