Wiseco K556M865AP -12cc Forged Piston Kit (86.50 mm) for Nissan SR20 ('91-

Vehicle Fitment

• Nissan SR-series 2.0L engines: SR20DE, SR20DET

Features

• Forged 2618-aluminum construction for high strength and durability
• ArmorGlide® skirt coating to reduce friction and resist seizure
• -12.00 cc dish design lowers compression - ideal for boosted or high-rev builds
• Fully machined crown with precise ring groove and anti-detonation design
• Forced-pin oiling for better lubrication at high RPM or load
• Designed for severe-duty and race-level performance applications
• Comes with a complete ring set and wrist pins for full rebuild
• Balanced for consistent performance across all four pistons

Specifications

• Bore: **86.50 mm**
• Compression Height: **32.00 mm**
• Piston Dish Volume: **-12.00 cc**
• Wrist Pin Diameter: **22.00 mm (0.866 in)**
• Material: Forged 2618 aluminum
• Ring Lands / Thickness: 1.0 mm / 1.2 mm / oil ring
• Included Ring Set: **8650XX**
• Approximate Piston Weight: ~337 g per piece

Included Components

• 4x Forged pistons
• 4x Wrist pins
• 4x Circlip locks
• 4x Full ring sets (top, second, oil)
• Installation/specification guide

Product Description

The Wiseco K556M865AP is a high-performance forged piston kit built for the Nissan SR20 2.0L engine family (SR20DE and SR20DET). With an 86.50 mm bore and -12 cc dish, it is optimized for lower compression setups - making it particularly well-suited for turbocharged or high-boost builds.

Constructed from 2618 aerospace-grade aluminum, these pistons can handle severe duty and high-RPM conditions. The ArmorGlide® coating on the skirts helps reduce friction and improves durability, while the forced-pin oiling design ensures adequate lubrication under load.

Each kit includes everything required for a complete rebuild: four pistons, wrist pins, locks, and a full ring set. Whether you're building a high-power drift car, a track turbo SR, or a serious street build, this Wiseco set provides the strength, precision, and reliability you need.