Wiseco 6240AS Professional Series 2618 Forged Piston – Chevy Big Block 4.500 in. Bore, Open Chamber Dome

The Wiseco 6240AS is a Professional Series forged replacement piston designed for Chevrolet Big Block engines with a 4.500-inch bore and a 9.750-inch deck height. Professional Series forged racing pistons from Wiseco are no-expense-spared pistons designed for the serious racer and builder, packed full of custom-level performance and durability features for use in heavy to severe duty race builds. This is a single/individual replacement piston sold without rings. Recommended ring set is W100F8-4500-5 (sold separately). Wrist pin S460 is included.

Key Specifications:

• Bore Size: 4.500 in.
• Deck Height: 9.750 in.
• Dome Style: Open Chamber Dome (502 Dome)
• Skirt Type: Full Round Skirt
• Material: 2618 High-Strength Forged Aluminum Alloy
• Included Pin: S460
• Recommended Ring Set: W100F8-4500-5 (sold separately)
• Application: Light Weight Drag / High Performance Street & Strip

Professional Series Features:

• 2618 Alloy Construction: Engineered, forged, and machined in the USA from 2618 aluminum for improved tensile strength.
• ArmorGlide® Skirt Coating: Seizure resistant, friction reduction, and quieter operation. ArmorGlide also allows the piston to be fitted tighter within the bore than a non-coated piston, improving ring seal and reducing piston rock noise.
• Optimized Valve Pockets: Designed to allow maximum flow around the valve while accommodating oversized valves and high-lift camshafts.
• Performance Crown Geometry: Piston crown shape promotes maximum intake charge efficiency through scavenging during intake and exhaust valve overlap.
• Detonation-Resistant Dome Design: Optimized quench during the compression/combustion cycle for resistance to detonation and pre-ignition, resulting in longer engine life and increased horsepower potential.
• Precision Ring Grooves: Machined with calculated groove root diameters and axial widths for maximum ring seal and minimized blow-by and oil consumption.
• Complex Skirt Profile: Engineered to reduce friction while maintaining stability in the bore for optimum ring seal.

Wiseco's 80+ year tenure in performance has led to a vast offering of automotive forged pistons designed and built to lead racers to victory. The 6240AS draws on that experience across venues including Formula 1, NHRA Pro Stock, and IRL Indy Racing to deliver race-proven technology in a single replacement piston. Rings are sold separately; wrist pin S460 is included.