4.155 MLS Head Gasket .027 - SBF

The 4.155 MLS Head Gasket .027 - SBF for Small Block Ford engines is the critical sealing component between your cylinder head and block that separates combustion pressure from coolant passages. Cometic Gaskets engineered this multi-layer steel (MLS) design for high-performance builds where stock gaskets fail under boost, nitrous, or aggressive naturally aspirated tuning. Whether you're rebuilding a 5.0 engine bay classic, freshening a tired 302, or assembling a stroker platform, a quality head gasket is non-negotiable—it's your foundation for reliability and power.

MLS gasket technology uses alternating layers of spring steel and elastomer to create a self-sealing surface that conforms to head and block deck finish variations while resisting blowby. The .027-inch thickness specification is engineered to deliver the correct combustion chamber volume and compression ratio for your Small Block Ford platform, making it a precision fit—not a generic substitute. Cometic's manufacturing tolerances ensure consistent bore roundness and gasket loading across all cylinders, preventing localized hot spots and gasket creep that plague inferior alternatives.

This gasket suits any SBF engine displacement from 255 to 408 cubic inches, provided deck height and bore diameter fall within the 4.155-inch specification window. Technicians and engine builders rely on Cometic for both stock restorations and modified platforms running up to 600+ horsepower—the MLS design handles sustained heat cycles and pressure spikes that would fail conventional cork or composition gaskets. Proper installation requires surfacing both head and block to specification, correct bolt torque sequencing, and quality fasteners; skimp on gasket quality and you risk head gasket failure, coolant intrusion, and catastrophic engine damage.