15-26 Cylinder Head Bolt Kits for Sidevalves

Restoring a classic 45 cubic inch Flathead or Servi-Car requires hardware you can trust, and this Colony cylinder head bolt kit is the highest quality available. These kits are accurately machined from high-strength steel and hardened to original Harley-Davidson specifications to ensure they will not stretch under the heat and pressure of a running engine. Each bolt features rolled threads for superior strength and a precise fit. To keep things looking sharp and to prevent corrosion over time, all the bolts, nuts, and washers in this set are plated. This kit is designed to replace OEM part number 15-26, offering a clean, authentic appearance for your vintage sidevalve project while providing modern reliability.