Top End

JE Pistons #370251 - Piston Kit - 4.125" Bore - +0.050" Oversize - 114"/117" M8

Piston Average Weight: 399 gramsPiston Volume: -1.30 ccTwo cylinder piston kit.Includes:• 2x Pistons• 2x Ring Sets• 2x Wrist Pins• 4x CirclipsFeaturesForged from 2618-T6 aluminum for better aligned...

JE Pistons #370252 - Piston Kit - 4.250" Bore - +0.175" Oversize - 114"/117" M8

Piston Average Weight: 425 gramsPiston Volume: -6.70 ccTwo cylinder piston kit.Includes:• 2x Pistons• 2x Ring Sets• 2x Wrist Pins• 4x CirclipsFeaturesForged from 2618-T6 aluminum for better aligned...

Jims #1732 - Roller Rocker Arms - Big Twin

Roller Rocker Arms - Big TwinFeaturesCast from 4340 heat-treated chromoly steelReduce friction in the valve train, providing more horsepower and less heat in the top endInclude 660 bronze bushing fit...

Jims #1807 - Hydraulic Tappet - Twin Cam

Hydraulic Tappet - Twin CamFeaturesThese tappets have undergone extensive development to increase load, lubrication, hydraulic and life capacitiesBillet bodyIncreased roller widthRoller...

Jims #1810 - Powerglide II Tappet - .005 - Twin Cam

Powerglide II Tappet - .005 - Twin CamFeaturesThese tappets have undergone extensive development to increase load, lubrication, hydraulic and life capacitiesBillet bodyIncreased roller widthRoller...

Jims #1820 - Hydrosolid Tappet - Twin Cam

Hydrosolid Tappet - Twin CamFeaturesPerform like a hydraulic tappet up to 5500 rpm, then turn into a solid tappetWhen they turn into solid tappets, it adds approximately three to six more usable...

Jims #1824 - Powerglide Tappet - Evolution

Powerglide Tappet - EvolutionFeaturesThe same Powerglide advantage (oil-fed axle, billet steel body, precision fit hydraulics), but now incorporates a Steady Roll bronze bushing in place of the...

Jims #1825 - Powerglide Tappet - .002 - Evolution

Powerglide Tappet - .002 - EvolutionFeaturesThe same Powerglide advantage (oil-fed axle, billet steel body, precision fit hydraulics), but now incorporates a Steady Roll bronze bushing in place of...

Jims #1827 - Powerglide Tappet - Standard - Twin Cam

Powerglide Tappet - Standard - Twin CamFeaturesThe same Powerglide advantage (oil-fed axle, billet steel body, precision fit hydraulics), but now incorporates a Steady Roll bronze bushing in place of...

Jims #5836 - Rocker Arm Shaft and Hardware Kit - M8

Rocker Arm Shaft and Hardware Kit - M8Features4130 stud and nut kit replaces the stock hardware used to secure the rocker shaftsCompared to a stock “bolt”, these JIMS manufactured studs allow the...

KB Performance #KB258.030 - Piston Kit - 3.498" +0.030" - 8.6:1 CR - 80" Evolution Big Twin

Piston Kit - 3.498" +0.030" - 8.6:1 CR - 80" Evolution Big TwinFeaturesManufactured from high-strength, T-5, heat-treated, 390 hypereutectic aluminum alloyAllow a tighter fit and longer piston and...

KB Performance #KB305.040 - Piston Kit - 3.498" +0.040" - 9.6:1 CR - 80" Evolution Big Twin

Piston Kit - 3.498" +0.040" - 9.6:1 CR - 80" Evolution Big TwinFeaturesManufactured from high-strength, T-5, heat-treated, 390 hypereutectic aluminum alloyAllow a tighter fit and longer piston and...

KB Performance #KB409C.005 - Piston Kit - 3.875" +0.005" - 10.0:1 CR - 103" Twin Cam | 96" Twin Cam Big Bore

Kit Includes:• 2x Pistons• 2x Wrist Pins• 4x Spiral Lock Pin Clips• 2x Ring SetsFeaturesManufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum alloyAllows a tighter fit and...

KB Performance #KB409C.010 - Piston Kit - 3.875" +0.010" - 10.0:1 CR - 103" Twin Cam | 96" Twin Cam Big Bore

Kit Includes:• 2x Pistons• 2x Wrist Pins• 4x Spiral Lock Pin Clips• 2x Ring SetsFeaturesManufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum alloyAllows a tighter fit and...

KB Performance #KB409C.STD - Piston Kit - 3.875" Standard - 10.0:1 CR - 103" Twin Cam | 96" Twin Cam Big Bore

Kit Includes:• 2x Pistons• 2x Wrist Pins• 4x Spiral Lock Pin Clips• 2x Ring SetsFeaturesManufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum alloyAllows a tighter fit and...