SBC MLS Head Gasket 4.200 Bore .040 (10pk)

The SBC MLS Head Gasket 4.200 Bore .040 from FEL-PRO is a critical engine seal designed for small-block Chevrolet performance builds and rebuilds. Built for enthusiasts and professional mechanics who demand reliability in high-compression applications, this multi-layer steel gasket pack of ten units provides the foundation for a leak-free cylinder head installation. Whether you're assembling a stock replacement engine or pushing boost through a modified small-block, proper head gasket selection is non-negotiable for long-term durability and peak combustion efficiency.

FEL-PRO's multi-layer steel (MLS) construction uses precisely engineered steel laminations to create superior sealing surfaces under extreme cylinder pressures and temperature cycling. The .040-inch thickness is engineered to match common SBC deck heights and provides optimal clamp load distribution across the gasket face. The 4.200-inch bore diameter accommodates standard and popular overbore configurations, while MLS technology resists blow-out in high-compression and forced-induction scenarios where traditional composite gaskets fail. This design allows the gasket to conform to modern machined surfaces while maintaining consistent sealing integrity through thousands of heat cycles.

Mechanics and engine builders choose this gasket for naturally aspirated street engines, mild cam upgrades, and supercharged small-block applications where combustion reliability matters. The ten-pack format makes it ideal for builders maintaining a shop inventory or completing multiple engine builds without reordering. Proper installation requires clean cylinder head and block deck surfaces, correct torque sequencing, and compatible fasteners; FEL-PRO gaskets work best when paired with quality head bolts and a methodical assembly approach. Compatible with 262, 283, 305, 327, 350, and 400 cubic inch small-block Chevrolet engines across restoration, street performance, and racing platforms.