4.165 MLS Head Gasket .036 - SBC

The Cometic Gaskets 4.165 MLS Head Gasket .036 - SBC is engineered for Small Block Chevy builders and engine rebuilders who demand reliable sealing under elevated compression and boost conditions. This multi-layer steel gasket bridges the cylinder head and block, preventing combustion gas and coolant leakage—critical for maintaining engine integrity during high-output performance builds, street racing, or competition applications. Whether you're freshening a stock 350 or assembling a stroker, a quality head gasket is non-negotiable for longevity and reliability.

The 0.036-inch compression thickness and multi-layer steel construction provide superior crush strength and conformability compared to traditional composite or single-layer designs. MLS (multi-layer steel) gaskets compress under bolt load to create a gas-tight seal across the bore, with the 4.165-inch bore diameter optimized for Small Block Chevy cylinder heads. The gasket's layered design accommodates minor surface irregularities on both head and block surfaces, reducing the risk of blow-through even in high-compression or naturally aspirated applications pushing 10:1 compression ratios or higher. This thickness class balances sealing performance with precise combustion chamber volume control—critical for accurate compression calculations and tuning.

This gasket is essential for any SBC rebuild—from carbureted street engines to EFI and boost applications—and pairs seamlessly with stock or aftermarket cylinder heads on 283, 327, 350, and 383 Small Block variants. Installation requires proper head bolt torque sequence (typically 60–70 ft-lbs for standard applications, higher for supercharged builds) and clean, smooth sealing surfaces. Choose this Cometic head gasket for guaranteed sealing performance when rebuilding, upgrading, or restoring your Small Block Chevy, ensuring reliability and preventing costly leaks that compromise performance and engine longevity.