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KB Performance Pistons

KB Performance Pistons

KB brand pistons are named after Keith Black, a drag racing pioneer who was a producer of high performance drag racing engines, often used in Top Fuel and Tractor pulling applications. KB pistons are manufactured according to his original designs.

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Products by KB Performance Pistons in our web shop:

KB Hypereutectic Stock Replacement Pistons
KB Hypereutectic Stock Replacement Pistons
These pistons by KB for Harley-Davidson motorcycles are made from Hypereutectic 390 alloy. This low expansion alloy allows for a tighter piston to wall running clearance compared to forged pistons. All pistons feature fully machined crowns and valve reliefs. The wrist pins are full floating. KB pistons are sold as pairs and include piston rings and triple wound spiral locks.
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KB Hypereutectic High Performance Pistons
KB Hypereutectic High Performance Pistons
Used for boring 883 Sportsters to 1200, these KB High Performance pistons are made from Hypereutectic 390 alloy. This low expansion alloy allows for a tighter piston to wall running clearance compared to forged pistons. The pistons feature fully machined crowns and valve reliefs. The wrist pins are full floating. KB pistons are sold as pairs and include piston rings and triple wound spiral locks.
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KB Forged Pistons 883cc→1200cc
KB Forged Pistons 883cc→1200cc
These KB Performance pistons for Harley-Davidson motorcycles are forged from low expansion 4032 alloy. They are preferred for high performance / high compression applications. KB pistons are sold as pairs and include piston rings and triple wound spiral locks.
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60-249
60-249
Pistons by KB Performance Pistons; fits 1200 cc / 74 cui. Knucklehead, Panhead, Shovelhead; aluminum; Over-/Undersize: +0.000 ”; stroke: 3-31/32 ”; nominal bore: 3-7/16 ”; 1200 cm³; compression: 8:1; outer Ø: 87.27 mm; USA; gross weight: 1.2 kg
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60-256
60-256
Pistons by KB Performance Pistons; fits 1200 cc / 74 cui. Knucklehead, Panhead, Shovelhead; aluminum; Over-/Undersize: +0.010 ”; stroke: 3-31/32 ”; nominal bore: 3-7/16 ”; 1200 cm³; compression: 8:1; USA; gross weight: 1.2 kg
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60-257
60-257
Pistons by KB Performance Pistons; fits 1200 cc / 74 cui. Knucklehead, Panhead, Shovelhead; aluminum; Over-/Undersize: +0.020 ”; stroke: 3-31/32 ”; nominal bore: 3-7/16 ”; 1200 cm³; compression: 8:1; USA; gross weight: 1.3 kg
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60-258
60-258
Pistons by KB Performance Pistons; fits 1200 cc / 74 cui. Knucklehead, Panhead, Shovelhead; aluminum; Over-/Undersize: +0.030 ”; stroke: 3-31/32 ”; nominal bore: 3-7/16 ”; 1200 cm³; compression: 8:1; outer Ø: 88.02 mm; USA; gross weight: 1.2 kg
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60-259
60-259
Pistons by KB Performance Pistons; fits 1200 cc / 74 cui. Knucklehead, Panhead, Shovelhead; aluminum; Over-/Undersize: +0.040 ”; stroke: 3-31/32 ”; nominal bore: 3-7/16 ”; 1200 cm³; compression: 8:1; USA; gross weight: 1.27 kg
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60-278
60-278
Pistons by KB Performance Pistons; fits Evolution Sportster 1986-2008; aluminum; Over-/Undersize: +0.000 ”; stroke: 3-13/16 ”; nominal bore: 3 ”; 883 cm³; compression: 9:1; USA; gross weight: 900 g
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60-279
60-279
Pistons by KB Performance Pistons; fits Evolution Sportster 1986-2008; aluminum; Over-/Undersize: +0.010 ”; stroke: 3-13/16 ”; nominal bore: 3 ”; 883 cm³; compression: 9:1; USA; gross weight: 911.6 g
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60-287
60-287
Pistons by KB Performance Pistons; fits Evolution Sportster 1986-2008; aluminum; Over-/Undersize: +0.020 ”; stroke: 3-13/16 ”; nominal bore: 3 ”; 883 cm³; compression: 9:1; USA; gross weight: 912.4 g
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60-288
60-288
Pistons by KB Performance Pistons; fits Evolution Sportster 1986-2008; aluminum; Over-/Undersize: +0.030 ”; stroke: 3-13/16 ”; nominal bore: 3 ”; 883 cm³; compression: 9:1; USA; gross weight: 898.2 g
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60-289
60-289
Pistons by KB Performance Pistons; fits Evolution Sportster 1986-2008; aluminum; Over-/Undersize: +0.040 ”; stroke: 3-13/16 ”; nominal bore: 3 ”; 883 cm³; compression: 9:1; USA; gross weight: 925.8 g
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60-298
60-298
Pistons by KB Performance Pistons; fits Evolution Sportster 1200cc 1988-2020; aluminum, 1.1 mm deeper valve pockets for high lift cams; Over-/Undersize: +0.000 ”; stroke: 3-13/16 ”; nominal bore: 3-1/2 ”; 1200 cm³; compression: 9:1; USA; gross weight: 1.2 kg
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60-301
60-301
Pistons by KB Performance Pistons; fits Evolution Sportster 1200cc 1988-2020; aluminum, 1.1 mm deeper valve pockets for high lift cams; Over-/Undersize: +0.020 ”; stroke: 3-13/16 ”; nominal bore: 3-1/2 ”; 1200 cm³; compression: 9:1; USA; gross weight: 1.2 kg
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60-335
60-335
Pistons »domed« by KB Performance Pistons; fits Evolution Big Twin 1984-1999; aluminum; Over-/Undersize: +0.000 ”; stroke: 4-1/4 ”; nominal bore: 3-1/2 ”; 1340 cm³; compression: 9.6:1; USA; gross weight: 1.25 kg
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60-336
60-336
Pistons »domed« by KB Performance Pistons; fits Evolution Big Twin 1984-1999; aluminum; Over-/Undersize: +0.005 ”; stroke: 4-1/4 ”; nominal bore: 3-1/2 ”; 1340 cm³; compression: 9.6:1; USA; gross weight: 1.25 kg
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60-337
60-337
Pistons »domed« by KB Performance Pistons; fits Evolution Big Twin 1984-1999; aluminum; Over-/Undersize: +0.010 ”; stroke: 4-1/4 ”; nominal bore: 3-1/2 ”; 1340 cm³; compression: 9.6:1; USA; gross weight: 1.26 kg
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60-338
60-338
Pistons »domed« by KB Performance Pistons; fits Evolution Big Twin 1984-1999; aluminum; Over-/Undersize: +0.020 ”; stroke: 4-1/4 ”; nominal bore: 3-1/2 ”; 1340 cm³; compression: 9.6:1; USA; gross weight: 1.3 kg
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60-339
60-339
Pistons »domed« by KB Performance Pistons; fits Evolution Big Twin 1984-1999; aluminum; Over-/Undersize: +0.030 ”; stroke: 4-1/4 ”; nominal bore: 3-1/2 ”; 1340 cm³; compression: 9.6:1; USA; gross weight: 1.3 kg
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