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Upgrade your Harley-Davidson Evolution Big Twin with the S&S CYCLE Super Stock™ Cylinder Head Kit, Part No. 90-1504. Designed for high performance and compatibility with stock 3-1/2" or 3-5/8" bore engines, these heads deliver exceptional airflow and power. Fully assembled, the heads feature stainless steel valves and high-lift springs capable of up to .640" lift, ensuring durability and optimized valve operation. The large 2.000" intake valves and 1.605" exhaust valves, combined with high-flow ports, supply ample air to support big inch engine builds, making this kit ideal for enthusiasts seeking significant performance gains. The heads are constructed to reuse stock headbolts, simplifying installation while maintaining reliability. Made in the USA, these heads are compatible with additional upgrades, and to complete your build, S&S Super Stock piston kits, intake manifolds, and gasket sets are sold separately. These heads are a perfect choice for riders aiming to maximize engine output with a reliable and high-quality component set.
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