Wiseco K421B6 Professional Series BBC Big Chief Forged Piston Set 4.560 in. Bore

The Wiseco K421B6 is a Professional Series forged piston set engineered for Chevrolet Big Block (BBC) Big Chief head applications.

Key Features:

• 2618 High-Strength Aluminum Alloy — forged, engineered, and machined in the USA for superior tensile strength and resistance to heat and detonation
• ArmorGlide® Skirt Coating — reduces operating friction, resists seizure, minimizes cylinder wear, and enables quieter operation
• Fully Machined Crown — precision-machined crown features for optimized combustion efficiency
• Vertical Gas Ports — improves ring seal and combustion pressure management under high-load conditions
• Anti-Detonation & Pressure Seal Grooves — added protection in heavy-duty and power-adder race environments
• Precision Ring Grooves — engineered for consistent ring seal and long service life

Designed for use in heavy to severe duty race builds, the Professional Series represents Wiseco's no-compromise approach to performance. Whether the application is naturally aspirated, nitrous, or forced induction, the K421B6 delivers the strength and precision required to build a championship-level Big Block Chevy engine.