Wiseco Pistons K425A100 in our Pistons Department

The Wiseco K425A100 is a Professional Series 2618 alloy forged piston set engineered for high-output Chevy Big Block 502 drag racing applications. Designed with a lightweight open-chamber dome profile and sized for a 4.600 in. bore, these pistons are purpose-built for engines running a 9.750 in. deck height. This set includes 8 pistons complete with wrist pins (S460). Rings are sold separately — recommended ring set is W100L8-4600-5.

Key Features:

• 2618 High-Strength Aluminum Alloy — a race-proven forging material prized for its superior tensile strength and resistance to heat fatigue under sustained high-load conditions
• Open Chamber Dome (502 Dome Profile) — optimized for open-chamber cylinder head pairings common in big block drag builds, promoting efficient combustion and quench
• Lightweight Drag Design — reduced reciprocating mass lowers parasitic load on the rotating assembly, contributing to faster rev response and more usable power
• Full Round Skirt — provides maximum bore contact area for enhanced piston stability, improved ring seal, and reduced piston rock under load
• Precision Machined Ring Grooves — calculated groove root diameters and axial widths deliver an excellent surface finish, maximum ring seal, and minimized blow-by and oil consumption
• Valve Pocket Design — generous valve reliefs allow maximum flow around the valve heads and accommodate oversized valves and high-lift camshafts
• Crown Shape for Cross-Flow Efficiency — piston crown geometry promotes maximum intake charge efficiency by leveraging scavenging during intake and exhaust valve overlap
• ArmorGlide® Skirt Coating — Wiseco's proprietary dry-film lubricant reduces friction, allows tighter piston-to-wall fitment, and improves wear resistance and quieter operation
• ISO-Certified Forging Facility — engineered, forged, and machined in Mentor, Ohio using advanced grain-flow-aligned forging technology

Includes: 8 pistons, wrist pins (S460). Rings sold separately — recommended ring set: W100L8-4600-5.

Wiseco's Professional Series represents their highest tier of automotive piston technology — no-compromise components built for serious racers and engine builders competing in demanding drag racing environments.