Wiseco K573M875AP Forged 87.5 mm +8 cc Pistons for Honda/Acura K-Series

Vehicle Fitment

• Honda / Acura K-Series engines (K20A, K20Z, K24 with K20 head)
• Acura RSX (K20, 2002-2006)
• Honda Civic Si and other K20/K24 applications

Features

• Forged from 2618 aerospace-grade aluminum for high strength and fatigue resistance
• ArmorGlide® skirt coating to reduce friction and improve wear resistance
• +8 cc dome design to boost compression for performance builds
• Strutted forging design for added rigidity under high stress
• Precision CNC-machined crown with optimized ring grooves
• Forced-pin oiling for reliable lubrication at high RPM
• Includes high-performance piston ring set (8750XX)
• Floating 22 mm wrist pins provide strong and stable piston-to-rod connection

Specifications

• Bore: 87.50 mm
• Compression Height: 30.00 mm
• Dome Volume: +8.00 cc
• Wrist Pin Diameter: 22 mm
• Piston Material: Forged 2618 aluminum
• Piston Weight: ~342 g each (nominal)
• Ring Set: 8750XX
• Compression Ratio: ~11.9:1 (for K20 application) :contentReference[oaicite:0]{index=0}

Included Components

• 4x forged dome pistons (87.5 mm, +8 cc)
• 4x 22 mm floating wrist pins
• 4x circlips / locks for wrist pins
• 4x performance piston ring sets (8750XX)

Product Description

The Wiseco K573M875AP is a top-tier forged piston kit crafted for Honda and Acura K-series engines, particularly for those running K20A, K20Z, or using a K24 block with a K20 head. With an 87.5 mm bore and a +8 cc dome design, these pistons significantly increase compression, making them ideal for high-performance, naturally aspirated builds.

Built from robust 2618 alloy, these pistons offer high fatigue strength and thermal stability. The ArmorGlide® coating on the skirts reduces friction and helps with smoother operation, while the strutted forging structure enhances stiffness during high-load situations. The kit includes high-quality 8750XX rings and 22 mm floating wrist pins to ensure reliable sealing and connection.

Proper installation demands checking bore-to-wall clearance, ring gap, and deck height. Because of the +8 cc dome, careful selection of head gasket thickness and combustion chamber volume is needed to achieve the desired compression ratio. This piston set is perfect for engine builders focused on strong throttle response, high RPM potential, and performance-focused reliability.