16813-51 Cylinder Head Bolt Kits for Sidevalves

These Colony cylinder head bolt kits are essential for anyone rebuilding a 45" Servi-Car sidevalve engine. When you're dealing with vintage Flatheads, you need hardware that won't stretch under heat, and these are machined from high-strength steel and hardened to original Harley specifications. The rolled threads offer superior strength and a precise fit compared to cut threads. This kit includes the head bolts, nuts, and washers, all plated for corrosion resistance and a clean, professional look. It serves as a high-quality replacement for OEM 16813-51, ensuring your top end stays sealed and secure for the long haul.