Description

The Cummins Cylinder Head Gasket C3958644 / C3958645 is a premium OEM-spec sealing solution designed to maintain proper combustion sealing, compression integrity, and long-term reliability in Cummins diesel engines . These head gaskets are available in **two thickness options—1.18 mm and 1.25 mm**—allowing precise selection based on piston protrusion and engine rebuild requirements. Cylinder head gasket thickness is critical for achieving the correct compression ratio and preventing combustion gas leakage, coolant loss, or oil cross-contamination. The C3958644 (1.18 mm) and C3958645 (1.25 mm) head gaskets are engineered to withstand extreme cylinder pressures and high operating temperatures common in modern and emissions-controlled diesel engines. Manufactured with reinforced fire rings and precision-cut sealing layers, these head gaskets ensure even clamping force across the cylinder head and block interface. Proper gasket selection helps restore factory performance, prevent overheating, and protect internal engine components during rebuilds or cylinder head service. These head gaskets are commonly installed during upper engine overhauls, cylinder head replacement, complete engine rebuilds, and professional remanufacturing projects . They are trusted by diesel technicians, fleet maintenance teams, and engine builders who require OEM-level fitment and durability. Available Thickness Options C3958644 – 1.18 mm Thickness C3958645 – 1.25 mm Thickness