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Upgrade your Harley-Davidson Big Twin with the S&S CYCLE Super Stock® Dual Plug Cylinder Head Kit, part number 90-1491. These heads come fully assembled, including valve seats, valves, guides, seals, and .590" lift valve springs. The kit also features collars, valve keepers, rocker cover gaskets, head gaskets, exhaust flange gaskets, and hardware for rocker housings, top engine mount, and carb support bracket, all with detailed instructions for easy installation. Designed to maintain a stock appearance, these heads provide improved airflow and performance compared to stock heads, making them a popular choice for enthusiasts seeking reliable power upgrades. Use OEM manifolds and exhaust components to ensure proper fit and function. Crafted in the USA, these heads are built with quality materials and precision engineering to meet the demands of high-performance riding. Whether you're restoring a classic bike or building a custom machine, this kit offers a straightforward upgrade that enhances both aesthetics and engine efficiency.
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