- Heavy-Duty Copper Construction: Made from robust 0.07-inch copper, this 3-inch exhaust gasket set includes two high-performance gaskets engineered to withstand extreme heat and pressure. Ideal for SBC, BBC, or custom engine exhaust collector upgrades. - Compatible Flange Design: Designed for 3-bolt flange setups with 3.3-inch spacing, these gaskets fit SBC/BBC 302, 350, 383, and 454 engines, as well as most aftermarket header collector systems. Simple installation allows for immediate performance improvements. - Secure O-Ring Seal: Each 3-inch header collector gasket features a raised O-ring ridge that ensures a tight, leak-proof seal without the need for additional sealants. This design is suitable for high-heat applications, helping prevent blowouts and maintain exhaust system integrity. - Performance Upgrade Ready: These gaskets effectively seal the exhaust flange, improving overall performance by maintaining backpressure, reducing noise, and eliminating power-robbing leaks. Suitable for any 3-inch header collector or performance exhaust configuration. Use Scenarios: 1. Upgrade your SBC or BBC engine with these gaskets to enhance exhaust flow and improve horsepower. 2. Replace worn or leaking gaskets in a custom exhaust system to prevent exhaust leaks and maintain optimal engine performance. 3. Ideal for high-performance racing applications where reliability and durability are essential.