3.945 MLS Head Gasket - .053 SBC LS1 LH

The FEL-PRO 3.945 MLS Head Gasket - .053 SBC LS1 LH is engineered for serious LS engine builders and mechanics tackling small-block Chevrolet and LS platform restorations. This driver-side head gasket seals the critical interface between your cylinder head and block, where combustion pressures, coolant passages, and oil galleries demand absolute reliability. Whether you're assembling a stock rebuild, a mild street engine, or preparing for higher-compression modifications, this gasket handles the demands of modern multi-layer steel gasket technology.

The 3.945-inch bore diameter matches your LS cylinder head's valve relief specifications, while the 0.053-inch compression thickness controls combustion chamber volume—a critical measurement for tuners fine-tuning compression ratios for fuel octane requirements and boost levels. FEL-PRO's multi-layer steel (MLS) construction uses specially coated stainless steel layers that resist corrosion, maintain clamping force under thermal cycling, and prevent gasket creep—a common failure mode in high-heat and high-boost applications. The left-hand (LH) designation ensures proper orientation for driver-side installation on your LS architecture, with precisely engineered bead geometry to seal without over-torquing cylinder head bolts.

Mechanics and engine builders restoring LS1, LS2, LS3, and LS-platform variants rely on OEM-equivalent gaskets like this to prevent coolant leaks, oil seepage, and combustion blowby—all of which degrade performance and durability. Proper installation requires torquing to specification with a clean, dry head and block surface; verify head bolt torque sequences in your engine manual to maximize gasket life. This gasket is sold individually, so order both driver and passenger sides for complete head gasket replacement. Compatible with factory and aftermarket LS cylinder heads used in Corvettes, Camaros, Trailblazers, and engine swap platforms where bore diameter and compression thickness specifications match.