Description

The Cummins Head Bolt Kit 6B-HBK is a high-strength diesel engine fastener kit designed to secure the cylinder head to the engine block , ensuring proper clamping force, gasket sealing, and long-term engine reliability in Cummins diesel engines. This kit is a direct replacement for Cummins OEM part number 3900231 , making it ideal for cylinder head installation, engine rebuilds, and complete overhauls. Manufactured from premium-grade, heat-treated alloy steel , the head bolts in this kit are engineered to withstand extreme combustion pressures, thermal expansion, and high torque loads common in heavy-duty diesel applications. The precision-threaded design ensures accurate torque application and uniform clamping across the cylinder head, which is critical for maintaining head gasket integrity and preventing combustion or coolant leaks. Designed for accurate fitment and OEM-spec torque retention , the Cummins 6B-HBK head bolt kit helps prevent bolt stretch, uneven clamping, and premature gasket failure. Replacing head bolts during cylinder head service or engine overhaul is strongly recommended to ensure proper torque values and long-term sealing performance. This head bolt kit is commonly used in Cummins diesel engine rebuild, overhaul, and cylinder head replacement applications , including on-highway trucks, industrial engines, and heavy-duty equipment.