Mr Gasket 7178C Copper Seal Collector And Header Muffler Gasket; Triangle; 3 Bolt Holes; 3.5 in. Dia; 4 7/16 in. Bolt Circle; 3/8 in. Bolt Hole; 2 pc;

The Mr. Gasket 7178C Copper Seal Collector and Header Muffler Gasket delivers a high-performance sealing solution for racing and street applications. Designed with a precision-cut triangle shape and three bolt holes, this gasket fits 3.5-inch diameter collector flanges with a 4 7/16-inch bolt circle and 3/8-inch bolt holes. Each pack includes two gaskets made from durable, heat-resistant copper that provides superior sealing under extreme exhaust temperatures and vibration. Part of Mr. Gasket’s trusted performance product line, the 7178C gasket ensures consistent exhaust flow while preventing leaks and blowouts. The solid copper construction allows for repeated use and excellent heat dissipation, making it ideal for high-performance engines and racing setups. Built for reliability and easy installation, these gaskets maintain a tight, long-lasting seal between the header and exhaust components for maximum performance and durability.