Wiseco 6634M8725 Honda K24 w/K20 Head Forged Piston +5cc 12.5:1 CR 87.25mm Bore

The Wiseco 6634M8725 is a Professional Series forged piston engineered for Honda K24 engines running a K20 cylinder head. Featuring an 87.25mm bore and a +5cc dome volume, this single piston delivers a 12.5:1 compression ratio — ideal for high-performance naturally aspirated builds that demand precise compression tuning and maximum durability.

Key Specifications:

• Bore: 87.25mm (3.435 in.) — 0.010 in. oversize
• Compression Height: 30.00mm (1.181 in.)
• Dome Volume: +5cc
• Compression Ratio: 12.5:1
• Pin Diameter: 22mm (0.866 in.)
• Rod Length: 152mm (5.984 in.)
• Stroke: 86mm
• Average Weight: 318 grams
• Quantity: Single piston (sold individually)

Professional Series Features:

• Forged from high-strength aluminum alloy for superior durability under extreme conditions
• Precision-machined ring grooves and advanced skirt coatings reduce friction and improve engine efficiency
• Dedicated forging specific to the final piston shape yields a stronger, lighter component versus cast alternatives
• Compatible with Honda K24 block paired with K20A/Z cylinder head (2002–2011 applications)
• Kit part number reference: K634M8725

Wiseco's Professional Series pistons are built for serious racers and engine builders who require uncompromising performance. Sold as a single piston, making it ideal for builders who need to replace or match an individual cylinder in an existing set.