Wiseco Pistons K0421X7 LS Stroker Forged Piston Kit 4.070 Bore 3.900 Stroke

The Wiseco K0421X7 is a high-performance forged piston kit designed for GM LS engines with a 4.070-inch bore and 3.900-inch stroke configuration. This complete 8-piston set features a -9cc dish design and delivers a 10.2:1 compression ratio, making it ideal for stroker builds seeking increased displacement and power output.

Key Specifications:

• Bore: 4.070 inches
• Stroke: 3.900 inches
• Rod Length: 6.125 inches
• Compression Height: 1.110 inches
• Wrist Pin Diameter: 0.927 inches
• Piston Head Volume: -9cc dish

Advanced Features:

• ArmorGlide skirt coating for lower friction, reduced noise, and superior life
• Strutted skirt design for exceptional strength, capable of running at as little as .004-inch clearance with minimal noise
• Radiused valve pockets for detonation resistance and increased flow around valves
• Anti-detonation grooves that keep the top ring groove free of carbon buildup
• Premium 1.2mm Nitride Steel Top, 1.2mm Napier 2nd, and Nitride 3mm oil GFX ring packs included
• Chrome moly wrist pins and Spirolox retainers included

This Wiseco Stroker Series piston kit is precision-engineered for GM LS2 and similar LS-based engines, providing the durability and performance needed for high-horsepower street and performance applications. Each kit includes pistons, rings, wrist pins, and circlips for a complete installation.