(1) Umbrella Valve Seals: For 3/8" Valves & OE-Size Guides

Fits: 3/8" Valve Stems • OE-Size Valve Guides (.900" Outer Diameter)

Valves seals keep unwanted oil from entering the combustion chamber through clearance in the valve guides

Normally used when a larger-than-stock diameter spring is used

Require no machining