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Enhance your Harley-Davidson Evolution Big Twin engine with the S&S Cycle Super Stock Cylinder Head Kit, designed specifically for models from 1988 to 1999. These heads deliver exceptional performance and are compatible with stock 3-1/2 inch or 3-5/8 inch bore engines, making them a versatile upgrade for big-inch builds. Fully assembled, the heads come with stainless steel valves and high-lift springs capable of up to .640 inch lift, ensuring reliable operation at high RPMs. The large 2.000 inch intake and 1.605 inch exhaust valves, combined with high-flow ports, supply ample air for increased horsepower and torque, enabling your engine to breathe better and produce more power. These heads are designed to work seamlessly with additional aftermarket modifications and upgrades, providing a solid foundation for further performance enhancements. To install, you must reuse your stock head bolts, simplifying the upgrade process. Made in the USA, these cylinder heads are built with quality craftsmanship and durability in mind, ensuring long-lasting performance. Please note that S&S Super Stock piston kits are required for optimal operation, and intake manifolds, pistons, and gasket kits are sold separately to complete your engine build. Whether you're restoring a vintage Harley or building a high-performance custom, the S&S Cycle Super Stock Cylinder Head Kit offers a reliable upgrade to unlock your engine's full potential.
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