Wiseco K634M88 Forged 88.00 mm Pistons for Honda K-Series (K20 / K24)

Vehicle Fitment

• Honda K20 (e.g., K20A2, K20Z1, K20Z3)
• Honda K24 (e.g., K24A-series with K20A/Z head)

Features

• Forged from high-strength 2618 aluminum alloy
• ArmorGlide® skirt coating for low friction and seizure resistance
• Strutted forging design for increased strength under high load
• Fully machined crown with valve reliefs and anti-detonation groove
• Forced-pin oiling to ensure reliable lubrication at the wrist pin
• Pre-gapped high-performance ring set (8800XX) included
• Designed for severe-duty racing or high-performance engines
• Optimized for both naturally aspirated and high-compression builds

Specifications

• Bore Diameter: 88.00 mm
• Compression Height: 30.00 mm
• Piston Volume / Dome: ~5.00 cc
• Compression Ratio Options: ~11.4:1 (K20) or ~13.0:1 (K24 with K20 head)
• Wrist Pin Diameter: 22.00 mm (0.866 in)
• Piston Material: Forged 2618 aluminum
• Piston Weight: ~327 g
• Ring Set: 8800XX

Included Components

• 4x Forged Pistons
• 4x Wrist Pins (22 mm)
• 1x Pre-gapped Ring Set (8800XX)
• 4x Piston Locks / Circlips

Product Description

The Wiseco K634M88 is a professional-grade forged piston kit designed specifically for Honda K-series engines. These pistons, made from 2618 aluminum, combine strength and durability to handle high RPMs and performance driving. With a bore of 88.00 mm and a compression height of 30.00 mm, they offer options for different compression builds depending on your setup.

The ~5 cc dome can deliver a compression ratio of around 11.4:1 on K20 blocks, or up to approximately 13.0:1 when used in a K24 block with a K20 head, making them ideal for both naturally aspirated and high-performance applications. The ArmorGlide® coating reduces friction and helps prevent scuffing, while the strutted forging design improves resistance under load. Forced-pin oiling ensures reliable lubrication, and the included 8800XX ring set comes pre-gapped for convenience and performance.

Whether you're building a high-compression naturally aspirated engine or a race-focused K-series setup, the K634M88 offers a reliable, high-strength foundation for long-term performance.