Chev Small Block Remflex 2040 Exhaust Manifold Gasket Set Stahl / Hooker REM2040Chev Small Block Remflex 2040 Exhaust Manifold Gasket Set Stahl Hooker REM2040 Chev Small Block Remflex 2040 Exhaust Manifold Gasket Set Stahl Hooker 1 15 16" Port; Chevy V8 Small Block Stahl Hooker Header Adaptor Flange Gasket, 1 15 16" Port Size, 2 Set Heating and cooling of the exhaust system causes header and manifold flanges to warp resulting in gaps between the head and header which Remflex exhaust gaskets seal completely due to the thickness