Wiseco K578M865AP Forged 86.5 mm -14 cc Dome Pistons for Nissan RB25DET

Vehicle Fitment

• Nissan RB25DET (Skyline 2.5 L 24V)
• Compatible RB25 non-DET applications when using 86.5 mm bore

Features

• Forged from 2618 aluminum for high strength and durability
• -14 cc dished design to lower compression for turbo or high-boost setups
• ArmorPlating/ArmorGlide® skirt coating reduces friction and resists seizure
• Strutted forging design enhances rigidity under high stress
• Fully machined crown with optimized ring grooves
• Forced-pin oiling for reliable lubrication at high RPM
• Includes high-performance piston ring set
• Floating 21 mm wrist pins for secure piston-to-rod connection

Specifications

• Bore: 86.50 mm
• Compression Height: 31.50 mm
• Piston Dish Volume: -14.00 cc
• Wrist Pin Diameter: 21 mm
• Piston Material: Forged 2618 aluminum
• Piston Quantity: 6 (for RB25 6-cylinder)
• Ring Set: Included
• Estimated Compression Ratio: ~8.4:1 (with standard head gasket)

Included Components

• 6x forged dished pistons (86.5 mm, -14 cc)
• 6x 21 mm floating wrist pins
• 6x circlips / locks for wrist pins
• 6x high-performance piston ring sets

Product Description

The Wiseco K578M865AP is a forged piston kit designed for the Nissan RB25DET engine. With an 86.5 mm bore and -14 cc dish, these pistons lower compression for turbocharged or high-boost applications.

Made from 2618 aluminum, the pistons are strong and durable, with ArmorPlating/ArmorGlide® coated skirts to reduce friction. The strutted forging design enhances structural integrity under high loads, and forced-pin oiling ensures reliable lubrication at high RPM.

This kit includes matching high-performance ring sets and 21 mm floating wrist pins. Proper installation requires checking bore clearance, ring gaps, and deck height to ensure optimal performance and reliability.