S&S Cycle

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Features114" to 128" big bore kit; 114" and 117" CVO to 128" big bore kitBolt-in kit, case maching not requiredForged pistonsIncludes oil pump/cam plate, pushrods with chrome covers, tappets, tappet...

Designed to add even more torque to your big bore M8, for those that keep the revs below 6000 rpmKits include all required bearings, o-rings, and hardwareGear drive cams provide improved valve...

Designed to add even more torque to your big bore M8, for those that keep the revs below 6000 rpmKits include all required bearings, o-rings, and hardwareGear drive cams provide improved valve...

FeaturesConstructed of 6061 billet aluminum with a high-strength steel check ball retainer for long-lasting durabilityHelps ensure engine properly regulates the amount of oil flow to oil cooler and...

FeaturesFits '84-'99 Harley-Davidson® big twin chasis and custom frames designed for Evolution® big twin engines+30% increase in HP and torque over stockShort stroke for less vibration and longer...

FeaturesFor '84-'99 Evolution Big Twin or '70-'99 custom chasis with alternator-style primarySpecially machined cylinder heads allow use of stock length manifold, use your existing carb (re-jetting...

FeaturesFor '84-'99 Evolution Big Twin or '70-'99 custom chasis with alternator-style primarySpecially machined cylinder heads allow use of stock length manifold, use your existing carb (re-jetting...

FeaturesFor '84-'99 Evolution Big Twin or '70-'99 custom chasis with alternator-style primarySpecially machined cylinder heads allow use of stock length manifold, use your existing carb (re-jetting...

FeaturesStock deck heightLarge volume sumpFits stock touring frameDesigned to accept larger boresAccepts all OEM style componentsReinforced case prevents cracking in high stress areas for increased...

FeaturesDual Spray technology evenly cools both intake and exhaust sides of pistonsRevised spray locations for more effective coolingCreates a cooler engine with more power and better durabilityMade...

Kit includes 8 studs with rounded thread roots, rather than flat, improving fatigue strength4140 Chrome Moly studs, oil quenched and tempered to 39-44 HRCPositive stop shoulder allows for consistent...