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. Part Type: Intake Valve. Valve Material: stainless steel.
Oldsmobile 400 425 455 MID-AIR™ MidRise Aluminum Intake Manifold [Satin]
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Oldsmobile 400 425 455 Satin Mid Rise Intake Manifold