Description

The Cummins Cylinder Head Gasket G-3921394 is an OEM-spec sealing component designed to maintain proper combustion sealing, compression integrity, and thermal stability in Cummins diesel engines . This head gasket is a direct replacement for Cummins OE part number 3804897 , ensuring precise fitment and long-term reliability during upper-engine service and rebuilds. Engine head gaskets are critical for sealing the combustion chamber while keeping coolant and engine oil properly isolated. The G-3921394 head gasket is engineered to withstand high cylinder pressures and extreme operating temperatures commonly found in heavy-duty diesel applications. Reinforced fire rings and precision-cut sealing layers help maintain even clamping force between the cylinder head and engine block. This gasket is commonly included in upper gasket sets and is installed during cylinder head replacement, valve train service, head resurfacing, and full engine overhauls . Using an OEM-spec head gasket helps restore factory compression ratios, prevent coolant or oil leaks, and protect internal engine components from premature failure. The Cummins G-3921394 head gasket is trusted by diesel technicians, fleet maintenance departments, and professional engine builders who require consistent sealing performance and OEM-level durability. Cross-Reference Aftermarket Reference: G-3921394 OEM Reference: 3804897 Application: Cylinder head gasket / upper gasket set component