Mr. Gasket 4816G - Header Gaskets - MLS - 396-454 Chevrolet Big Block Mark IV 1965-90

? Multi-Layered Steel (MLS) exhaust and header collector gaskets are designed for extreme cylinder pressures produced by high horsepower-high compression turbo-charged, supercharged and nitrous oxide injected engines. ? Manufactured from three stainless steel layers, they resist corrosion, will not burn through or push out and maintain maximum fastener torque retention. ? Stress formed inner and outer layer embossments act like springs that rebound under exhaust flange clamp load, creating force to seal extreme exhaust pressures. Total gasket thickness .075 Ì?. ? Will not deteriorate from scrubbing action caused by different expansion rates in aluminum and steel materials.