S&S CYCLE Super Stock Cylinder Head Kit for Evolution Big Twin 1988-1999 - Part #90-1004

Product type: Top End Components

SKU : 0930-0007

Regular price $1,949.95 USD

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Cylinder Head Kit - Super Stock™ - Natural - Evolution Big Twin '88-'99 Upgrade your Harley-Davidson Evolution Big Twin engine with the...

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Cylinder Head Kit - Super Stock™ - Natural - Evolution Big Twin '88-'99

Upgrade your Harley-Davidson Evolution Big Twin engine with the S&S CYCLE Super Stock Cylinder Head Kit, part number 90-1004. Designed for models from 1988 to 1999, this fully assembled kit features high-performance components built to enhance airflow and power output. The heads are compatible with stock 3-1/2" or 3-5/8" bore engines, making installation straightforward for those familiar with Harley-Davidson engines. Crafted in the USA, these heads incorporate stainless steel valves and high-lift springs with up to .640" lift, ensuring durability and optimal valve operation under demanding conditions. The large 2.000" intake and 1.605" exhaust valves, combined with high-flow ports, supply ample air and fuel mixture to support big inch engine builds, resulting in increased horsepower and torque. This kit is a perfect upgrade for riders seeking improved performance without extensive modifications, although it requires reuse of the stock head bolts. For complete engine enhancement, S&S Super Stock piston kits, intake manifolds, and gasket sets are sold separately. Whether you're rebuilding or upgrading, these heads offer reliable performance and quality craftsmanship that meet American manufacturing standards, ensuring longevity and consistent performance on the road.

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