ALL ENGINE

Features Contains the best quality gaskets Made in the USA Notes Top-end gasket kit do not include rocker box gaskets; must be purchased separat...

Features Contains the best quality gaskets Made in the USA Notes Top-end gasket kit do not include rocker box gaskets; must be purchased separat...

Features Contains the best quality gaskets Made in the USA Notes Top-end gasket kit do not include rocker box gaskets; must be purchased separat...

Features 3.5" stock bore cylinder case for any stroke up to and including 5" and most stock length connecting rods Machined to accept an oil filte...

Features 3.625" big bore cylinder case for any stroke up to and including 5" and most stock length connecting rods Machined to accept an oil filte...

Features High-quality, heavy duty rod sets come complete and ready to install Set includes front and rear rods, crankpin and nuts, steel cages and...

Features 3.5" stock bore cylinder case for any stroke up to and including 5" and most stock length connecting rods Machined to accept an oil filte...

Features Replacement gasket kit for rocker box part number 90-4095 Specs Product Name Gasket Kit Type Rocker Box Units Kit Riding Style ...

Features Positive O-ring seal ensures leak-free operation Includes rocker boxes, gaskets and mounting bolts Rocker arm supports included Made in t...

Features Includes all required gaskets and O-rings for both rocker boxes Note: For S&S Box only. Specs Product Name Gasket Kit Type Ro...

Features New-style breather is not dependent on the rotation of the crankshaft to make it open and close. Instead, reeds open when pressure in the...

Features New-style breather is not dependent on the rotation of the crankshaft to make it open and close. Instead, reeds open when pressure in the...

Features Stock-height basic engine is direct bolt in replacement for aging 80" H-D Evolution engines Specially machined cylinder heads allow use o...

Features Complete assembled 50 state legal engine for '84-'98 carbureted non-catalyst Big Twins or '70-'99 custom chassis with alternator-style pr...

Features Made of high-strength forged steel and designed for stock and high-performance custom applications Special keyed 6° large diameter tapere...

Features Made of high-strength forged steel and designed for stock and high-performance custom applications Special keyed 6° large diameter tapere...

Features Stock-height basic engine is direct bolt in replacement for aging 80" H-D Evolution engines Specially machined cylinder heads allow use o...

Features Fits '84-'99 Harley-Davidson® big twin chasis and custom frames designed for Evolution® big twin engines +30% increase in HP and torque o...

Features Fits '84-'99 Harley-Davidson® big twin chassis and custom frames designed for Evolution® big twin engines +30% increase in HP and torque ...

Features Complete assembled 50 state legal engine for '84-'98 carbureted non-catalyst Big Twins or '70-'99 custom chassis with alternator-style pr...

Features Fits in a stock frame just like a stock engine with a little more punch with S&S Super E carburetor, S&S 508 camshaft, and high f...

Features Kit includes standard flywheel assembly, 3.625" Sidewinder® stroker big bore cylinder, 9.75:1 compression ratio pistons, rings and gasket...

Features Kit includes standard flywheel assembly, 3.625" Sidewinder® stroker big bore cylinder, 9.75:1 compression ratio pistons, rings and gasket...

Features For large displacement engines 110" and larger with 10.5:1 to 11.5:1 compression and smaller engines, 96"-107" with 11.0:1 to 12.0:1 comp...