4.100 MLX Head Gasket .040 GM LT1/LT4 Gen-V

The 4.100 MLX Head Gasket .040 GM LT1/LT4 Gen-V is engineered for serious LS platform builders and performance enthusiasts pushing the limits of their fifth-generation small-block engines. This multi-layer steel (MLS) gasket delivers the compression seal and thermal stability required when upgrading cylinder heads, stroking displacement, or running forced induction on modern GM LT architecture. Whether you're refreshing a stock engine or building a race-ready powerplant, this gasket ensures leak-free performance across a wide operating envelope.

The .040-inch compressed thickness and 4.100-inch bore diameter are precision-matched to LT1 and LT4 combustion chamber geometry, ensuring uniform sealing pressure around all firing surfaces. The MLX construction combines multiple steel layers with proprietary facing materials to resist gasket creep, maintain clamp load under thermal cycling, and prevent detonation-induced blow-by common with thinner gaskets on boosted or high-compression builds. This design excels where OEM composite gaskets fail—under sustained boost, nitrous oxide injection, or high cylinder pressures exceeding 14:1 compression ratios.

Engine builders, LS swappers, and tuners rebuilding C8 Corvette mills, 5th-gen Camaro powerplants, or truck engine combinations will find this gasket indispensable for long-term durability and reliability. Installation requires proper deck surface finish (63 microinches Ra or better) and accurate torque sequencing; pair with a quality head-bolt set and fresh intake manifold gaskets for best results. Compatible with both naturally aspirated and supercharged LT1/LT4 configurations, this gasket is essential for any machine shop or performance builder stocking genuine OEM-replacement or aftermarket cylinder head sealing solutions.