LH Head Gasket 03-21 Hemi 5.7L

The LH Head Gasket 03-21 Hemi 5.7L is a critical sealing component engineered for Dodge, Jeep, and Ram platforms running Mopar's legendary Gen III Hemi engine. Whether you're rebuilding after high-mileage wear, addressing a blown gasket, or performing a complete cylinder head refresh, this driver-side head gasket serves as the precision barrier between your combustion chamber and cooling passages. Built by MAHLE ORIGINAL/CLEVITE—OEM-trusted manufacturers—this gasket is the component serious enthusiasts and professional mechanics specify for reliability and longevity.

This multi-layer steel construction features a 3.970-inch bore diameter and 0.031-inch compression thickness, designed to maintain consistent sealing pressure across the entire combustion cycle. The MLS (Multi-Layer Steel) design prevents blowby, coolant weeping, and oil leakage by distributing clamp load evenly across the gasket surface. Unlike softer composite materials, steel core construction resists thermal cycling—critical on the Hemi 5.7L, which operates at elevated combustion temperatures and generates significant cylinder pressure. The precisely engineered bore sizing ensures perfect alignment with your cylinder walls, eliminating the risk of gasket erosion or hot spots that plague inferior aftermarket alternatives.

This gasket fits 2003–2021 Hemi 5.7L applications across all Mopar Gen III platforms, making it essential for any 5.7 rebuild from mild street engines to high-output modified builds. Installation requires proper surface preparation, correct torque sequencing, and alignment with OEM specifications—work best handled by experienced technicians familiar with Hemi head bolt patterns. Pair this driver-side gasket with a matching passenger-side unit for complete engine sealing. For anyone running vintage Hemis or late-model Jeep and Ram trucks, sourcing OEM-quality gaskets like this ensures your investment in machine work and new fasteners delivers years of reliable performance.