SBC Copper Head Gasket 4.155 x .043

The SBC Copper Head Gasket 4.155 x .043 from SCE Gaskets is a precision-engineered sealing component designed for small-block Chevrolet engine builds and rebuilds. Built for enthusiasts and professional engine builders who demand reliable cylinder head sealing, this gasket is essential when assembling high-performance or stock-displacement SBC applications. Whether you're freshening an original 350 or constructing a modified 383 stroker platform, proper head gasket selection directly impacts combustion chamber integrity, coolant containment, and overall engine longevity.

This copper head gasket features a 4.155-inch bore diameter with a .043-inch thickness, critical dimensions that ensure correct sealing surface contact and proper combustion chamber volume calculations for your specific engine configuration. Copper construction provides superior thermal conductivity and conformability compared to steel-only gaskets, allowing the gasket material to compress uniformly across the cylinder head deck and block surface. The .043-inch thickness is optimized for standard SBC head and block surfaces, maintaining precise valve timing geometry and piston-to-valve clearance while delivering consistent clamp load distribution across all eight cylinders.

This gasket suits both street and competition small-block Chevrolet engines across displacement ranges from 283 to 406 cubic inches, provided your cylinder head and block deck surfaces are properly machined and cleaned. Installation requires standard head bolt torque sequences—typically 60–70 foot-pounds on iron heads—with verification that all fasteners are ARP or equivalent high-strength hardware for maximum clamp load retention. Proper surface preparation, including chemical cleaning and light honing to remove machining debris, is critical to gasket performance; this investment in prep work prevents early leakage and ensures the gasket's full lifespan during engine operation.