Patriot Header Flange - 0.375 in Thick - 2 in Round Port - Big Block Chevy - Pair Intake Manifold Gasket Spacers keep the piston safely

Spacers keep the piston safely in the bore of the caliper

Deep dish allows air to flow under nose wing uninterupted

launch and overrev

oil thermostats

Patriot Header Flange - 0.375 in Thick - 2 in Round Port - Big Block Chevy - Pair Intake Manifold Gasket Spacers keep the piston safelyPatriot Exhaust H7899 Header Flange Chevrolet Big Block 396 502 Tube Diameter 1 3 4" 2" Same As Port. Precision machined header flanges Heavy duty 3 8" thick material Supplied with our premium head gaskets A wide variety of tube diameters and port shapes available; Patriot Exhaust products continue to offer the best value for the dollar of any brand in the industry. This year's product offering presents sixteen new applications for popular muscle cars