COMP Cams Teflon Valve Seals - 3/8 w/ .500 Guide Threaded Insert Tool Kit Universal bolt pattern with a

Universal bolt pattern with a 5/8" pilot hole

Special casting materials

1975-1978 GMC C25 Suburban

Mechanical Follower

COMP Cams Teflon Valve Seals - 3/8 w/ .500 Guide Threaded Insert Tool Kit Universal bolt pattern with aCOMP's Positive Stop PTFE valve seals offer more clearance for dual springs with better sealing than O ring or umbrella seals. These 512 seals have a . 600" outer diameter and fit applications with 3 8" valves and . 500" OD valve guides. The COMP Cams philosophy has never changed: make the highest performing products possible and lead the industry in technological development. One thing COMP Cams has never forgotten: Performance is defined by what