Cylinder Head Gasket MLS 3.950 Bore GM LS

The Cylinder Head Gasket MLS 3.950 Bore GM LS is the precision sealing component every LS engine builder and performance mechanic relies on for dependable combustion chamber integrity. Whether you're assembling a stock 5.3L, tuning a 6.0L, or building a high-output stroker, this MAHLE ORIGINAL gasket maintains the critical seal between cylinder head and block that prevents coolant crossover, oil weeping, and combustion gas bypass. Designed specifically for the Gen III and Gen IV LS platform's 3.950-inch bore specification, it's the OEM-quality choice for street builds, race engines, and restoration work where reliability cannot be compromised.

This gasket employs multi-layer steel (MLS) construction, a core technology that delivers superior conformability to imperfect deck surfaces and exceptional thermal cycling resistance compared to traditional composite gaskets. The MLS design uses elastomer-coated steel laminations that flex slightly under load, accommodating the minute variations in head and block finish that inevitably occur during machining and assembly. MAHLE ORIGINAL's engineering ensures consistent clamp load retention across the gasket's sealing surface, preventing the progressive leakage that plagues inferior alternatives in high-heat or high-boost applications. The 3.950-inch bore dimension is precisely matched to LS platform specifications, guaranteeing proper fire-ring positioning and combustion chamber protection.

LS engine enthusiasts installing stock replacement heads, upgrading to aftermarket aluminum cylinders, or refreshing tired original equipment benefit most from this gasket's proven durability and hassle-free installation. Use it with proper head bolt torque sequencing and a quality gasket sealer on the MLS surface to ensure maximum sealing efficiency on both standard and modified engines. Compatible with all GM LS variants from 1997 forward that feature the 3.950-inch bore, including truck engines, performance crate motors, and swapped applications—making it the dependable foundation for any LS top-end job worth doing right.