Brian Tooley Racing Valve Stem Seal - 0.342 in Valve Stem - 0.552 in Valve Guide OD - Viton® (Set of 16) KYB5550015 They have 5/16" hex-heads and

They have 5/16" hex-heads and come in sets of (8) with reusable bowl screw gaskets

but do nothing for performance

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Safety CapMelling Engine Parts got its start soon after World War II

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Brian Tooley Racing Valve Stem Seal - 0.342 in Valve Stem - 0.552 in Valve Guide OD - Viton® (Set of 16) KYB5550015 They have 5/16" hex-heads andProduct Description: Valve Stem Seal 0. 342 in Valve Stem 0. 552 in Valve Guide OD Viton Set of 16 Brian Tooley Racing (BTR) started as a small operation fueled by Brian Tooley's passion for engine performance and innovation. In the early 1990s, Tooley began his journey in the performance industry by working on cylinder heads and founding Total Engine Airflow (TEA). Eventually, he shifted to creating custom parts for enthusiasts, leveraging his