RH Head Gasket 03-21 Hemi 5.7L

The RH Head Gasket 03-21 Hemi 5.7L is a critical engine seal engineered for the right-hand (passenger) side cylinder head on third and fourth-generation Mopar Hemi engines. Whether you're rebuilding after high-mileage wear, addressing a cooling system leak, or performing a top-end refresh on your Dodge, Jeep, or Chrysler, this MAHLE ORIGINAL/CLEVITE gasket delivers OEM-specification sealing where combustion pressure and coolant passages meet. Proper head gasket integrity is non-negotiable for reliability—failure results in coolant intrusion into oil, cross-cylinder leakage, or catastrophic overheating.

This right-side head gasket features a 3.970-inch bore diameter and 0.031-inch compression thickness, utilizing a multi-layer steel construction that resists blow-by and maintains a consistent seal across thermal expansion cycles inherent to modern boosted and naturally aspirated Hemi platforms. The multi-layer design distributes clamping load evenly across the gasket face, preventing localized hot spots that lead to premature failure. MAHLE ORIGINAL gaskets are manufactured to exact OEM tolerances and material specifications, ensuring fitment with factory head bolt torque sequences and eliminating the risk of bore distortion or coolant seepage that inferior aftermarket alternatives often introduce.

This gasket suits any serious Hemi owner or mechanic performing head gasket replacement, engine rebuilds, or head resurfacing on 2003–2021 generation III and IV Hemi 5.7L engines found in Ram trucks, Chargers, Challengers, and Grand Cherokees. Always replace both head gaskets (left and right) as a pair during engine work to ensure symmetrical sealing and prevent future mid-job callbacks. Proper surface preparation of the cylinder head and block, correct head bolt torque specifications, and use of the appropriate sealant are critical for installation success and longevity.