4.125 MLS Head Gasket .040 - SBC

The Cometic Gaskets 4.125 MLS Head Gasket .040 for SBC (small-block Chevy) is designed for builders and enthusiasts who require maximum reliability when pushing their engine's limits. This gasket is ideal for both stock restorations and modified engines, providing superior sealing integrity compared to traditional composition gaskets.

Featuring a 4.125-inch bore and a .040-inch compressed thickness, this multi-layer steel (MLS) head gasket balances combustion chamber volume stability with adequate crush for proper clamping load distribution. The MLS construction prevents common failure modes like creep and blow-by, especially under high boost or nitrous applications, ensuring durability and performance.

This gasket is compatible with any SBC platform with a 4.125-inch bore diameter, including 327, 350, and stroker combinations up to 383 cubic inches. Proper installation is crucial, requiring correct head bolt torque sequencing and freshly surfaced cylinder heads and block deck to maximize the gasket's potential.