Description

The Cummins Cylinder Head Gasket G-3921394 is an OEM-spec sealing component engineered to maintain proper combustion sealing, compression integrity, and long-term durability in Cummins diesel engines . This gasket is a direct replacement for Cummins OE part number 3804897 , ensuring factory-correct fitment and dependable engine performance. Designed to withstand extreme cylinder pressures and high operating temperatures, the G-3921394 head gasket features precision-cut sealing surfaces and reinforced fire rings to deliver even clamping force between the cylinder head and engine block. Proper sealing is critical to preventing compression loss, coolant leaks, and oil cross-contamination—common issues during upper-engine failures. This head gasket is commonly supplied as part of an upper gasket set and is installed during cylinder head replacement, valve train service, upper engine overhauls, and complete engine rebuilds . Using an OEM-spec head gasket helps restore factory compression ratios, protect internal components, and extend overall engine service life. Trusted by diesel technicians, fleet maintenance teams, and professional engine builders, the Cummins G-3921394 head gasket delivers consistent sealing performance in demanding diesel applications. Cross-Reference Aftermarket Reference: G-3921394 OEM Reference: 3804897 Application: Cylinder head gasket / upper gasket set component