Chevy BBC 454 1966-00 3/16" Thick Rubber Steel Core Valve Cover Gasket Set Black These can be used on

These can be used on std or aftermarket plenum manifolds

but very vital component found in this mass orchestra of mechanics is the idle air control valve

while delivering increased engine vacuum

36 element Pro Mod Sprag and new large steel outer race to allow the use of more clutches

or choke control in the way

Chevy BBC 454 1966-00 3/16" Thick Rubber Steel Core Valve Cover Gasket Set Black These can be used onSpeedmaster 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