Cylinderhead Conversion Kits

2 products

Our Cylinder Head Conversion Kits range for Harley-Davidson covers big-bore and stock-bore head solutions for 1966-1984 Shovelhead motors, including 3-5/8 inch big-bore cylinders and stock-bore builds. Supplied by Iron City Motorcycles, an Iron City authorised HD dealer in Leeds, this performance-focused section is led by S&S with kits that let classic Harley-Davidson engines breathe more freely and reliably. Converting Shovelhead heads is one of the most popular ways to unlock extra torque, cooler running and better top-end durability on long rides. Whether you are building a resto-mod Big Twin, upgrading a weekend cruiser or preparing a long-distance Harley-Davidson, these kits give your engine a real step up. Every order ships fast from UK stock with expert workshop support from Leeds. Browse the full range below.