Wiseco K670M9000 Forged Piston Set Nissan QR25DE 2.5L 90mm Bore 8.6:1 CR

The Wiseco K670M9000 is a Professional Series forged piston set engineered for the Nissan QR25DE 2.5L 16-valve four-cylinder engine.

Key Features:

• Material: Forged and machined in the USA from 2618 aluminum alloy for superior tensile strength under high-stress conditions
• ArmorGlide® Skirt Coating — reduces friction, resists seizure, and enables quieter operation
• Fully machined crown with precision ring grooves, anti-detonation groove, and enhanced ring seal geometry
• Specially designed valve pockets and optimized skirt profiles for multivalve engine compatibility
• Forced pin oiling for improved lubrication under heavy-duty performance use
• Includes premium 9000XX steel nitride/napier ring set and S623 wrist pin (20mm / 0.787 in.)

Specifications:

• Bore: 90.00 mm / 3.543 in. (+0.040 in. oversize)
• Stroke: 100 mm / 3.937 in.
• Rod Length: 143 mm / 5.630 in.
• Compression Height: 32 mm / 1.260 in.
• Pin Diameter: 20 mm / 0.787 in.
• Head Volume: -19.5cc (dish)
• Block Height: 225.5 mm / 8.878 in.
• Compression Ratio: 8.6:1
• Piston Weight: 345 g (each)
• Replacement Pin: S623
• Replacement Rings: 9000XX

The Wiseco K670M9000 Professional Series piston kit is built for serious engine builders tackling heavy to severe-duty performance builds. Each piston is produced from dedicated in-house forgings, delivering a lightweight yet exceptionally strong component designed to withstand the demands of forced induction and high-revving applications on the QR25DE platform.