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use Speedmaster cast iron cylinder heads
They're available in a variety of styles
Put together your own custom exhaust system with these Speedmaster collector reducers
all our models include a 0-90 ohm GM sending unit
Oldsmobile 400 425 455 Blue 3/16 Thick Rubber Steel Core Valve Cover Gasket Set use Speedmaster cast iron cylinderSpeedmaster valve cover gaskets are manufactured from high quality rubber, which is molded over and vulcanized to a rigid steel frame. They won't leak, blow out, or get sucked in, the way stock or inferior quality aftermarket gaskets can. These gaskets feature superior quality rubber and steel, which outlast cork and rubber composite designs to provide years of dependable service, especially if you frequently have to remove and reinstall the valve
