4.100 MLS Head Gasket .040 - SBF

The 4.100 MLS Head Gasket .040 - SBF by COMETIC GASKETS is an essential component for small-block Ford engine builders and high-performance enthusiasts. This Multi-Layer Steel (MLS) gasket is engineered to seal the critical interface between your cylinder head and engine block, preventing coolant and combustion gas leakage. Whether you're rebuilding a classic muscle car engine, upgrading a daily driver, or preparing a race motor, this gasket delivers the reliability and performance expected from Cometic's premium gasket lineup.

MLS head gaskets like this 4.100-inch bore model use multiple layers of spring steel with elastomer coating to provide superior sealing under extreme pressure and temperature cycling. The .040-inch thickness is precisely engineered to match your cylinder head's mounting surface and maintain proper combustion chamber volume, ensuring accurate compression ratio and optimal engine performance. Unlike single-layer gaskets, Cometic's MLS design resists blowby, reduces core shift, and accommodates the micro-finish variations found on aluminum and cast-iron heads. This particular gasket is optimized for small-block Ford applications, offering dependable sealing whether you're running stock boost or elevated boost pressures.

Mechanics and engine builders trust Cometic MLS gaskets for durability across naturally aspirated, supercharged, and turbocharged small-block Ford engines. The 4.100 bore size is compatible with standard SBF (small-block Ford) cylinder heads and blocks, making this gasket suitable for 289, 302, 351W, and related displacement builds. Proper installation requires clean, flat surfaces and correct head bolt torque sequencing—consult your engine manual for specifications. Stock this gasket for your next rebuild, performance upgrade, or repair project to ensure leak-free operation and long-term reliability.