Wiseco K671M8950 Sport Compact Piston & Ring Kit for Nissan QR25DE 2.5L 16V

The Wiseco K671M8950 is a Sport Compact Piston and Ring Kit engineered for the Nissan QR25DE 2.5L 16V engine. Designed for builds that demand more than stock, this kit delivers forged strength, tighter tolerances, and power-adder-ready construction in a complete, ready-to-install package.

Wiseco's Sport Compact series pistons are forged from high-silicon, low-expansion aluminum alloy, providing superior strength, reduced weight, improved heat transfer, and extended service life compared to cast alternatives. Each piston features a diamond-turned finish from CNC-controlled machining centers, ensuring consistent sizing and a precision fit within the cylinder bore.

Key Features:

• Forged aluminum construction for maximum strength and durability
• 89.50mm bore diameter — verify your cylinder bore before ordering
• Crown thickness and ring lands engineered for power adders including turbochargers, superchargers, and nitrous oxide
• Includes high-quality piston rings matched to the bore spec
• Chromium alloy steel wrist pins and retaining clips included
• Precision Spirolox® or round-wire snap rings for secure pin retention
• Manufactured and machined in the USA at Wiseco's facility in Mentor, OH
• Compatible with cast iron, chrome, Nikasil, and boron composite cylinder bores

The K671M8950 is part of Wiseco's proven Sport Compact piston line, trusted by performance builders and road racers alike. Whether you're refreshing a high-mileage engine or building for forced induction, this kit provides the foundation for a reliable, high-performance QR25DE build.