Cometic Exhaust Header / Manifold Gasket - 1.55 x 1.45 in Square Port - Small Block Chevy (Pair) 20-GNHD4035K8 If you use exotic fuels

If you use exotic fuels or additives such as alcohol

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PolyMatrix H Compound

Schoenfeld Headers is the world’s largest manufacturer of circle-track headers

Cometic Exhaust Header / Manifold Gasket - 1.55 x 1.45 in Square Port - Small Block Chevy (Pair) 20-GNHD4035K8 If you use exotic fuelsCometic Gasket Inc. Exhaust Gaskets are designed to be used with manifolds or headers. Offered in a range of materials to make sure you are covered with any cylinder head and manifold header combination. All exhaust gaskets are designed to be used without the use of messy sealants. Product Description: Exhaust Header Manifold Gasket 1. 55 x 1. 45 in Square Port Steel Core Laminate Small Block Chevy Pair Since 1989, Cometic Gasket has grown into a