4.200 MLS Head Gasket .040 - SBF

The 4.200 MLS Head Gasket .040 - SBF is a precision-engineered cylinder head gasket designed specifically for small block Ford engine builds and rebuilds. Whether you're performing a complete engine overhaul, addressing a blown gasket, or assembling a performance-oriented mill, this multi-layer steel gasket provides the critical seal between your cylinder head and engine block that determines compression integrity and combustion efficiency. Engine builders and mechanics rely on this component to prevent coolant leaks, oil seepage, and compression loss that can compromise reliability and power output.

This gasket features multi-layer steel (MLS) construction, which delivers superior sealing performance compared to traditional single-layer designs. The MLS technology uses multiple thin steel layers with elastomer coatings to create a conformable, durable seal that handles thermal cycling and combustion pressures without permanent set. The .040-inch compression thickness is precisely calculated for small block Ford applications, ensuring proper gasket crush and maintaining critical deck height specifications. The 4.200-inch bore diameter matches the standard small block Ford cylinder bore, making this gasket compatible with everything from classic 289 and 302 engines to modern 5.0L variants used in restoration, street, and competition builds.

Mechanics and engine builders tackling small block Ford projects—whether naturally aspirated, supercharged, or turbocharged—depend on premium head gaskets to prevent catastrophic failures and expensive teardowns. During installation, proper torque sequencing and head bolt tension are critical; this gasket performs optimally when cylinder head bolts are tightened to manufacturer specifications in the correct sequence. Each gasket is sold individually, allowing you to purchase the exact quantity needed for your project. For high-performance applications, nitrous oxide injection, or elevated boost levels, verify that your engine internals and head design are compatible with this standard compression thickness to avoid over-compression or gasket erosion.