4.030 MLS Head Gasket .040 - SBF

The Cometic Gaskets 4.030 MLS Head Gasket .040 (C5511-040) is a precision-engineered multi-layer steel cylinder head gasket designed for Small Block Ford engines. This gasket delivers the sealing integrity required for high-compression and performance applications where OEM gaskets fall short. The .040-inch compression thickness and 4.030-inch bore diameter are optimized for SBF engine blocks, providing reliable containment of combustion pressure and coolant circulation across the critical interface between cylinder head and block.

Multi-layer steel construction is the industry standard for serious Small Block Ford builds because it resists blow-out under elevated boost pressure and thermal cycling better than single-layer alternatives. The .040 thickness is a popular choice for street and mild performance engines, offering a balance between compression ratio and gasket durability. Cometic's MLS design prevents coolant migration and maintains consistent clamping load across repeated heat cycles—critical for engines that see track time, towing, or sustained high RPM operation. The 4.030-inch bore diameter ensures proper cylinder wall exposure and maintains the sealing bead's position under thermal expansion.

This gasket is essential for SBF engine rebuilds, stroker swaps, turbocharged conversions, and any situation where original gaskets have failed or performance modifications demand superior sealing. Whether you're refreshing a classic 289 or 302, or assembling a modern performance crate engine, Cometic MLS head gaskets are trusted by engine builders and enthusiasts who cannot afford mid-race head gasket failure. Proper head bolt torque specification and cylinder head surface preparation are mandatory for optimal performance with this gasket.