Description
Brand: COMP Cams
Manufacturer’s Part Number: 521-8
Part Type: Engine Valve Stem Oil Seals
Product Line: COMP Cams Valve Seals
Automotive Fittings Part Number: CCA-521-8
UPC: 036584151791
Valve Stem Diameter (in.): 0.375 in.
Valve Stem Diameter (mm): 9.53mm
Valve Stem Seal Type: Positive stop
Valve Stem Seal Material: Viton®
Machine Work Required: No
Valve Guide Diameter (in.): 0.500 in.
Valve Stem Seal Outside Diameter (in.): 0.500 in.
Quantity: Sold as a set of 8.
Notes: Designed for triple spring. Requires machining the top of the valve guide with a special .500 in. diameter cutter.
Description:
COMP 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.
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