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barrel-shaped
you can get 25 to 50 HP from these Proform main bodies
to increase flow for more performance
providing competition engine builders with the most accurate valvetrain components available today
Chevy BBC 396 454 Copper Exhaust Gasket Set barrel-shapedThese Speedmaster exhaust gaskets are made from thick copper, and feature an embossed ridge around the exhaust port for a tight, leakproof seal. The copper gaskets help even out the flow between the head and header flange to minimize warping. Also, they'll conform to rough or irregular surfaces to maintain a positive seal, while keeping the header bolts tight.
