4.250 MLS HEad Gasket .040 - AMC 390/401

The 4.250 MLS Head Gasket .040 for AMC 390/401 engines is an essential component for builders and restorers of classic American muscle cars. This gasket is designed to provide superior sealing and durability, making it ideal for those looking to enhance performance or restore vintage engines.

Constructed from multi-layer steel (MLS), this head gasket eliminates the limitations of older designs, ensuring excellent resistance to fuel, coolant, and blow-by gases. Its .040-inch thickness is specifically engineered for AMC big-block cylinder head geometry, maintaining proper compression ratios and quench distance for optimal engine performance.

This gasket is particularly beneficial for those rebuilding AMC 390 or 401 engines after machine work, upgrading to performance camshafts, or installing higher-compression pistons. Proper selection of the head gasket is crucial for achieving the best ring seal quality and overall engine reliability.