Exhaust Block Off Plates SBC Spread Port Aluminum 1964-chevrolet-biscayne-esi1477011 500 in Arch - 250

500 in Arch - 250 lb/in Spring Rate - 3600-3800 lb Car Weight - Steel - Black Paint - Chevy Camaro Style - Each

12 in Thick - Chromoly - Black Oxide - Each Fits 403 engines w/stock heads

3/5 - FIA Approved - Double Layer - Nomex - Silicone Palm - Black / Blue - Large - Each

5 in OD - 12 in Length - 200 lb/in Spring Rate - Single Pigtail - Steel - Black Powder Coat - Each

625 in Primary - 3 in Collector - Gaskets / Hardware Included - Steel - Black Paint - Small Block Ford - Ford Fullsize Truck 1969-79 - Pair

Exhaust Block Off Plates SBC Spread Port Aluminum 1964-chevrolet-biscayne-esi1477011 500 in Arch - 250Exhaust Port Blockoff 1 Piece Aluminum Natural Spread Port Heads Small Block Chevy Pair