8mm LS Steel & Viton Dual/Single Spring Valve Stem Seals (Suits: 0.4825" Guides) They feature a stout billet

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

and all accessory gaskets--everything that you need for a complete engine rebuild

awesome looking setup for your carburetor

Leaks can lead to the death of your rear end

Speedmaster rear calipers are some of the strongest on the market

8mm LS Steel & Viton Dual/Single Spring Valve Stem Seals (Suits: 0.4825" Guides) They feature a stout billetValve 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.