15-26 Cylinder Head Bolt Kits for Sidevalves

This Colony cylinder head bolt kit is an essential upgrade for any 45 cubic inch Flathead or Servi-Car engine build. These head bolt, head nut, and washer kits are manufactured to the highest standards, using high-strength steel that has been hardened to original Harley specifications to prevent stretching. The bolts feature rolled threads, which provide much better strength and fitment than cut threads. All components are plated for a clean, corrosion-resistant finish that looks great on a restored vintage machine. Replacing OEM number 15-26, this kit provides the durability and period-correct look needed for a professional engine restoration, ensuring your cylinder heads stay properly torqued for years to come.