8mm LS Steel & Viton Dual/Single Spring Valve Stem Seals (Suits: 0.500" Guides) or better known to mechanics

or better known to mechanics as the IAC

capable of withstanding valve spring load

If it has to seal right the first time Speedmaster has what you need

this nut is an essential part of maintaining the tension and alignment of the supercharger belt

Upgrade your GM Powerglide or TH400 for extreme horsepower applications with this big shaft stator tube kit

8mm LS Steel & Viton Dual/Single Spring Valve Stem Seals (Suits: 0.500" Guides) or better known to mechanicsValve 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.