8mm LS Steel & Viton Dual/Single Spring Valve Stem Seals (Suits: 0.4825" Guides) withstanding up to 190

withstanding up to 190

which include heat-treated studs with rolled threads and special nuts with built-in serrated washer faces

If your standard Bowtie block could handle 1500+ HP it would be Speedmaster's H1 engine block

while promoting more consistent torque loading

Speedmaster carburetor adapters are designed to allow you to mount most any carburetor on most any manifold

8mm LS Steel & Viton Dual/Single Spring Valve Stem Seals (Suits: 0.4825" Guides) withstanding up to 190Valve 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.