7711-18-Z Head bolt kit

This Colony head bolt kit is a vital component for anyone servicing the top end of a 1937 to 1948 74-inch or 80-inch SV Big Twin. Specifically designed for models running aluminum heads, these fasteners are finished in zinc and follow the original OEM style for an authentic appearance. Big Twin side-valves require robust hardware to maintain a proper head gasket seal, and Colony’s precision manufacturing ensures these bolts meet those demands. Sold as a kit, this set provides the exact hardware needed to secure your aluminum heads to the cylinders. It is a high-quality replacement for tired or stretched original bolts, ensuring your vintage U, UL, or UH model stays reliable.