Top End

One-piece stainless-steel, stellite-tipped valves impregnated by a special nitrided process with .002" depth and .0002" surface buildup to improve wear properties and reduce frictionThis process provides resistance to corrosion; wears superior to hard...

One-piece stainless-steel, stellite-tipped valves impregnated by a special nitrided process with .002" depth and .0002" surface buildup to improve wear properties and reduce frictionThis process provides resistance to corrosion; wears superior to hard...

600" max lift kits are designed for maximum performanceFeature interference-wound, double-chrome silicone springs; heat-treated steel base washersInclude steel retainersMade in the U.S.A.

One-piece stainless-steel, stellite-tipped valves impregnated by a special nitrided process with .002" depth and .0002" surface buildup to improve wear properties and reduce frictionThis process provides resistance to corrosion; wears superior to hard...

600" max lift kits are designed for maximum performanceFeature interference-wound, double-chrome silicone springs; heat-treated steel base washersInclude steel retainersMade in the U.S.A.

600" max lift kits are designed for maximum performanceFeature interference-wound, double-chrome silicone springs; heat-treated steel base washersInclude steel retainersMade in the U.S.A. Harley-Davidson -- Blackline FXS -- (2013, 2012, 2011);...

One-piece stainless-steel, stellite-tipped valves impregnated by a special nitrided process with .002" depth and .0002" surface buildup to improve wear properties and reduce frictionThis process provides resistance to corrosion; wears superior to hard...

S&S heads are available to be used with stock-style flat-top pistonsKits are fully assembled, and include stainless steel valves and high-lift (.585") springsIntake manifold and gasket kits are sold separately; gasket kits contain head gaskets, base...

S&S heads are available to be used with stock-style flat-top pistonsKits are fully assembled, and include stainless steel valves and high-lift (.585") springsIntake manifold and gasket kits are sold separately; gasket kits contain head gaskets, base...

Include springs, upper and lower collars and keysFor valve lift to .650" with 1.860"/178 lbs. installed height, 376 lbs. at max liftMax 6500 rpmMade in the U.S.A. Harley-Davidson -- Wide Glide EFI FXDWGI -- (2016, 2015, 2014, 2013, 2007, 2010, 2012,...

S&S heads are available to be used with stock-style flat-top pistonsKits are fully assembled, and include stainless steel valves and high-lift (.585") springsIntake manifold and gasket kits are sold separately; gasket kits contain head gaskets, base...

High port flow gives great performance now, and more later when additional upgrades are doneHeads are fully assembled with springs and valvesCompression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression...