S&S Cycle Super Stock™ Cylinder Head Kit556148229 Product Description S&S heads give great performance, and work with additional upgrades Compatible with stock 3 1 2" or 3 5 8" bore engines Fully assembled, and include stainless steel valves and high lift springs (up to . 640 lift) Large 2. 000" intake and 1. 605" exhaust valves and high flowing ports supply plenty of air for big inch engines Must reuse stock headbolts Made in the USA Notes S&S Super Stock piston kits are required. Intake
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