Wiseco K634M87 87mm Forged Piston Kit Honda K24 with K20 Head 12.8:1 Compression

The Wiseco K634M87 is a high-performance forged piston kit specifically engineered for Honda K24 engine blocks paired with K20A or K20Z cylinder heads. This premium piston set delivers an aggressive 12.8:1 compression ratio, making it an ideal choice for naturally aspirated builds seeking maximum power output.

Key Specifications:

• Bore: 87mm (3.425 inches) - Standard Size
• Compression Ratio: 12.8:1 (K24 with K20 head) or 11.0:1 (K20 block)
• Compression Height: 30mm (1.181 inches)
• Pin Diameter: 22mm (0.866 inches)
• Dome Volume: +5cc
• Piston Weight: 316 grams
• Compatible Stroke: 99mm (K24)
• Compatible Rod Length: 152mm

Advanced Features:

• Manufactured from aerospace-grade 2618 aluminum alloy for superior strength and heat resistance
• Dedicated in-house forgings engineered specifically for Honda K-Series applications
• ArmorGlide® skirt coating reduces friction, noise, and wear while freeing up additional horsepower
• Specially designed valve pockets accommodate high-lift camshafts and oversized valves
• Fully machined dome and crown shapes optimize combustion efficiency
• Precision ring grooves for perfect seal and reduced blow-by
• Steel nitride/Napier XX piston rings included for superior sealing and durability

Complete Kit Includes:

• Four (4) forged pistons with optimized skirt profiles
• Four (4) wrist pins (Standard Pin: S618)
• Four (4) sets of wrist pin locks (W5590)
• Four (4) complete piston ring sets (Ring Part #: 8700XX)

Performance Applications:

This piston set is designed for serious naturally aspirated builds combining a K24 block with a K20A or K20Z cylinder head. The 12.8:1 compression ratio is optimized for high-octane race fuel and builds targeting maximum power output. The +5cc dome volume and precision-engineered valve pockets ensure proper clearance while promoting efficient combustion and power delivery.

Quality & Manufacturing:

Wiseco's 80+ years of racing heritage ensures every piston meets the highest standards. Engineered, forged, and CNC machined at their state-of-the-art facility in Mentor, Ohio, these pistons represent the pinnacle of Sport Compact piston technology. The dedicated forging process creates a lightweight yet incredibly strong piston that can withstand extreme conditions.

Replacement Parts Available:

• Wrist Pins: S618
• Piston Rings: 8700XX
• Wrist Pin Locks: W5590

Wiseco pistons are the choice of professional engine builders and serious enthusiasts who demand maximum performance and reliability from their Honda K-Series builds.