4.200 MLS Head Gasket .036 - SBC

The 4.200 MLS Head Gasket .036 for Small Block Chevy (SBC) from Cometic Gaskets is engineered for enthusiasts and professional mechanics rebuilding or modifying classic and modern small-block Chevrolet engines. Multi-layer steel (MLS) head gaskets represent the gold standard in cylinder head sealing, offering superior reliability compared to traditional composition gaskets, especially when peak cylinder pressures exceed stock parameters. Whether you're freshening a stock 350 or assembling a high-compression stroker build, this gasket delivers the durability and leak-free performance required for street, strip, and race applications.

Cometic's MLS construction uses multiple layers of spring steel and elastomer to create a uniform, compressible seal that conforms to head and block surfaces under varying pressures and temperatures. The .036-inch thickness is precisely calibrated to control quench distance while maintaining proper gasket crush for optimal sealing without over-compression. This specific geometry, combined with a 4.200-inch bore diameter, matches small-block Chevy specifications and accommodates popular deck heights from stock 9.025-inch blocks to performance variants. The MLS design resists blow-by, oil weeping, and coolant leakage far better than conventional gaskets, making it ideal for forced-induction builds, nitrous applications, or naturally aspirated high-RPM engines where thermal and mechanical stress is elevated.

This head gasket is the essential choice for any serious SBC rebuild—from 262 cubic-inch restores to 427-plus displacement monsters. Installation requires proper surface prep (machining or honing both block and head decks to a 32-microinch finish or better), correct head bolt torque sequences, and quality fasteners to ensure consistent clamping load. The gasket's proven track record across thousands of engine builds makes it a trusted specification for machine shops, speed shops, and DIY builders who refuse compromise on reliability. Stock up on this OEM-grade component for your next SBC project and eliminate head gasket concerns permanently.