8mm LS Steel & Viton Dual/Single Spring Valve Stem Seals (Suits: 0.4825" Guides) Four corner water ports

Four corner water ports

Speedmaster rear calipers are some of the strongest on the market

They feature a stout billet aluminum construction and include all mounting hardware

These manifolds require a universal 4-barrel throttle body

Leaks can lead to the death of your rear end

8mm LS Steel & Viton Dual/Single Spring Valve Stem Seals (Suits: 0.4825" Guides) Four corner water portsValve 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.