VALVE STEM SEAL 3/8 .530 VITON (each)

Comp Valve Stem Seals Positive Stop Viton .375in (3/8) Stem, .530in. Guide with an OD of .625in. Set of 16. Requires machining the top of the valve guide with a special .500 in. diameter cutter.OMP Cams offers a complete line of valve seals, from the stock GM O-rings to the positive-stop PTFE seals. They are a must to keep unwanted oil from entering the combustion chamber through the clearance in the valve guides. The O-ring seals use the standard retainer and oil splash shield. The umbrella seals are normally used when a larger-than-stock diameter spring is used. In the case of a double spring, the positive stop PTFE seals are used. For triple-spring applications, use the smaller-diameter Viton seals.