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They use silicon aluminum bi-metal construction
To remain street legal with a square bore carb
along with optimized winding
and come in machined or polished finishes to suit your application needs
Speedmaster piston oil ring spacers are manufactured from spring steel and install against the bottom sill of the oil ring groove
Ford FE 390 427 428 1.650" 5.450" 3/8" Stainless Steel Exhaust Valves They use silicon aluminum bi-metalWhen it's time for valves, don't cut corners. Get genuine Speedmaster stainless steel valves. They're made from a tough, stainless steel alloy and are carefully designed to increase gas flow for more power. What's more, they have hardened stem tips for durability and are swirl polished.
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