Wiseco 6243A125 Forged Dome Piston 4.5125 in. Bore Chevy Big Block

The Wiseco 6243A125 is a Professional Series forged dome piston designed for Chevrolet Big Block engines, featuring a 4.5125-inch bore diameter (+0.125" oversize) and a 1/16 in. / 1/16 in. / 3/16 in. ring groove configuration. Sold individually and supplied with a groove lock spacer, this piston delivers race-proven strength and precision for high-performance builds.

Key Features:

• Forged aluminum alloy construction — forged from 2618 or 4032 aluminum for superior strength and heat resistance under extreme conditions
• Dome crown design — optimized for high-compression applications, promoting efficient combustion and maximum power potential
• Precision CNC-machined — machined to tight tolerances for excellent ring seal, minimized blow-by, and reduced oil consumption
• Valve pocket design — maximizes flow around the valve and accommodates oversized valves and high-lift camshafts
• Complex skirt profile — reduces friction while maintaining bore stability for consistent ring seal
• ArmorGlide skirt coating — Wiseco's proprietary skirt coating reduces operating friction, allows tighter piston-to-wall fitment, and improves wear resistance
• ISO-certified forging facility — manufactured using advanced materials and feature-aligned grain flow technology
• Ring grooves: 1/16 in., 1/16 in., 3/16 in.
• Includes: Groove lock spacer (chromoly wrist pins and Spirolox retainers included per set)

Wiseco Professional Series pistons are engineered to handle the demands of turbocharged, supercharged, nitrous, and naturally aspirated high-performance Big Block Chevy builds. Backed by decades of race-winning piston development across Formula 1, NHRA Pro Stock, AMA Superbike, and Motocross, Wiseco delivers the technology and reliability serious engine builders demand.