11/32" Steel & Viton Valve Stem Seals (Suits: 0.530" Guides) Speedmaster aluminum pulleys are made

Speedmaster aluminum pulleys are made from a 356 aluminum alloy that is heat-treated to T-6 specs

These Speedmaster valve springs are better-designed valve springs using state-of-the-art machinery for purpose-built racing engines

heat-treated and shot-peened

Speedmaster cast iron brake calipers are designed for 13" corvette conversion kits made by PCE

For performance ball joints from a name you can trust

11/32" Steel & Viton Valve Stem Seals (Suits: 0.530" Guides) Speedmaster aluminum pulleys are madeValve stem seals control the lubrication of the valve stem as it slides in the valve guide. Too little oil causes stem and guide wear. Too much oil increases oil consumption and can cause a buildup of carbon, leading to valve seat damage and early valve grind. Speedmaster valve seals are posi stop seals made from high temperature Viton material for a long lasting seal.