Head & Main Stud Combo Kit - 1983–1998 3.9L 4BT 4CYL Dodge Cummins

Fortify the 4BT From Top to Bottom. The 4BT earned its reputation by refusing to quit — so build it to match. This combo pairs our 3.9L 4BT head stud kit with our main stud kit, locking down both ends of the engine in a single upgrade. Head studs seal the cylinder head against boost and heat up top, while main studs stabilize the crankshaft main caps down below. Whether it's powering a swap build, a work truck, or an off-road rig, this is the foundation that holds up under pressure. Why Drivers Choose XOTIC PERFORMANCE™ Top-to-Bottom Strength – Head studs keep your head gasket sealed under turbo pressure and heat, while main studs add bottom-end stability and help prevent main cap walk under load. Superior Clamping Force – Studs torque cleanly and stay stationary instead of twisting like bolts, delivering more consistent clamp load and reducing wear on your block and head threads. XOTIC 7200 Material – Built from our 7200-series alloy for greater tensile and yield strength than standard 8740 chromoly, with threads rolled after heat treatment for maximum fatigue life. Everything You Need – Complete head stud and main stud hardware in one kit — studs, 12-point nuts, hardened washers, rocker bolts, assembly lubricant, and install tools. Lifetime Warranty – Every fastener is backed by XOTIC PERFORMANCE™ for total peace of mind. The smart choice for 4BT builders who want to do it once and do it right — seal the head and secure the bottom end in a single upgrade.