Wiseco's Sport Compact pistons are made from dedicated forgings produced in-house to give you a light weight piston with superior strength and optimal design. Being the multivalve piston technology leader, the line features specially designed valve pockets, complex dome and crown shapes, the steel nitride/napier xx rings and optimized skirt profiles. The pistons come standard with ArmorGlide® coating material for reduced friction and noise, freeing up horsepower.

Wiseco's pistons outgun cast and Hypereutectic pistons, giving you stronger pistons and tighter tolerances than any other part in your engine, with less internal and external machining. Wiseco's advanced forging process and extensive heat-treat and finishing process assure you of the performance and reliability you demand from your high performance engine.

K640M875

• Bore: 87.50mm / 3.445in
• Stroke: 94mm / 3.701in
• Rod Length: 150.55mm / 5.927in
• Compression Height: 32.25mm / 1.27in
• Head cc's: 42cc
• Dome Dish: -13.3cc
• Gasket Thickness: 0.5mm / 0.018in
• Deck Clearance: 1.0- mm / 0.040- in
• Block Height: 231mm / 9.095in
• Compression Ratio: 9.5:1
• Pin Diameter: 22.5mm / 0.886in
• Ring #: 8750XX
• Weight: 342g

K640M88

• Bore: 88.00mm / 3.464in
• Stroke: 94mm / 3.701in
• Rod Length: 150.55mm / 5.927in
• Compression Height: 32.25mm / 1.27in
• Head cc's: 42cc
• Dome Dish: -13.3cc
• Gasket Thickness: 0.5mm / 0.018in
• Deck Clearance: 1.0- mm / 0.040- in
• Block Height: 231mm / 9.095in
• Compression Ratio: 9.5:1
• Pin Diameter: 22.5mm / 0.886in
• Ring #: 8800XX
• Weight: 348g

NOTE: During install, the oil squirters must be bent 1/8" to 3/16" towards the center in order for them to clear the piston skirt upon compression.