90-1499 Shovel cylinder head kit. 3-5/8" bore. Natura

Give your big-bore Shovelhead a serious performance boost with this S&S cylinder head kit. Designed for 1979 to 1984 Big Twins equipped with 3-5/8 inch big bore cylinders and band-style intake manifolds, these natural aluminum heads are a significant upgrade over stock. While original heads typically flow around 124 cfm, these S&S units are engineered to flow approximately 135 cfm, providing much better breathing for your engine. The kit comes fully assembled with valves, springs, collars, and valve guide seals already installed. It also includes all necessary gaskets for the heads, rocker covers, and exhaust, along with mounting hardware. These heads are ready to run right out of the box and can safely accommodate high-performance camshafts with a lift of up to .590 inches.