Complete Engines & Rebuild Kits

Super stock heads and crankcaseS&S easy start camsHigh-flow oil pumpForged flattop pistonsIntake system not included; compatible with stock or aftermarket intake systems4-1/8 bore x 4-1/8 stroke9.8:1 compression ratioWrinkle black finishCylinder heads on...

Lower Compression, 10.2:1, for great street torqueIncludes Super Stock heads, T2 crankcase, high flow oil pump, cam cover and easy start gear drive camsStock Twin Cam 96 bolt patternSpecs: displacement 124"; bore 4-1/8"; stroke 4-5/8"; 585 cam; piston...

High Compression, 10.8:1 for the ultimate in street performanceNo fuel system or ignition systems includedSpecial head machining fits stock length intake manifolds (S&S manifold size 410)Stock style breathing system; compatible with stock and most...

Lower Compression, 10.2:1, for great street torqueIncludes Super Stock heads, T2 crankcase, high flow oil pump, cam cover and easy start gear drive camsStock Twin Cam 96 bolt patternSpecs: displacement 124"; bore 4-1/8"; stroke 4-5/8"; 585 cam; piston...

High Compression, 10.8:1 for the ultimate in street performanceNo fuel system or ignition systems includedSpecial head machining fits stock length intake manifolds (S&S manifold size 410)Stock style breathing system; compatible with stock and most...

Prox Engine Rebuild Kit 10.Ek5806.C1 Polaris -- Ranger Crew 800 4x4 -- (2013, 2014, 2012, 2011); Polaris -- Ranger 800 6x6 -- (2013, 2011, 2016, 2012, 2014, 2015); Polaris -- Sportsman 800 EFI 4x4 -- (2012, 2013, 2014, 2011)

Prox Engine Rebuild Kit 10.Ek5806.C Polaris -- Sportsman X2 800 -- (2007, 2009); Polaris -- Ranger 800 HD -- (2010); Polaris -- RZR 800 EPS LE 4x4 -- (2010); Polaris -- RZR 800 4x4 -- (2009, 2010, 2008); Polaris -- RZR 800 LE -- (2009, 2010); Polaris --...

Prox Engine Rebuild Kit 10.Ek5806.B Polaris -- Sportsman 800 EFI 4x4 -- (2009, 2007, 2008, 2010); Polaris -- Ranger 800 MVRS -- (2010); Polaris -- RZR 800 4x4 -- (2010, 2008, 2009); Polaris -- RZR 800 LE -- (2010, 2009); Polaris -- Sportsman X2 800 --...

Prox Engine Rebuild Kit 10.Ek5806.A1 Polaris -- Sportsman 800 EFI 4x4 -- (2012, 2011, 2013, 2014); Polaris -- Ranger Crew 800 4x4 -- (2011, 2012, 2014, 2013); Polaris -- Ranger 800 6x6 -- (2012, 2014, 2011, 2016, 2015, 2013)

Prox Engine Rebuild Kit 10.Ek5806.A Polaris -- Sportsman X2 800 -- (2007, 2009); Polaris -- Ranger 800 HD -- (2010); Polaris -- RZR 800 EPS LE 4x4 -- (2010); Polaris -- RZR 800 4x4 -- (2009, 2010, 2008); Polaris -- RZR 800 LE -- (2009, 2010); Polaris --...

Prox Engine Rebuild Kit 10.Ek5805.C1 Polaris -- RZR S 800 4x4 -- (2012, 2013, 2011, 2014); Polaris -- RZR 4 800 4x4 -- (2013)

Prox Engine Rebuild Kit 10.Ek5805.C Polaris -- Sportsman 800 EFI 4x4 -- (2008, 2009)