Wiseco 6492B125 Quick 8 Pro Series 2618 Forged Piston 4.625 Bore Solid Dome Gas Ported

The Wiseco 6492B125 is a Professional Series Quick 8 forged racing piston engineered for serious drag race and high-performance big-block engine builds. Forged from 2618 aluminum alloy, this individual replacement piston features a 12–14 degree solid dome configuration with a 4.625-inch bore and is designed for a 9.750-inch deck height block. It is fully nitrous compatible and includes vertical gas ports to maximize ring seal under extreme combustion loads.

Quick 8 Series Highlights:

• 2618 Alloy Forging: Race-grade aluminum alloy delivers exceptional strength-to-weight ratio and thermal fatigue resistance demanded by high-horsepower applications
• Strutted Skirt Design: Reinforced forging architecture keeps piston weight low while preventing the cracking common in slab or full-round forgings under race conditions
• Solid Dome with 0.200-inch Thick Deck: Allows custom valve pocket machining for severely angle-cut heads, or dome removal to create a flat-top configuration
• Vertical Gas Ports: Routes combustion pressure behind the top ring during the power stroke, dramatically improving ring seal and reducing blow-by
• Nitrous Compatible: Dome profile and material spec are engineered to withstand the increased cylinder pressures and heat generated by nitrous oxide induction
• ArmorGlide Skirt Coating: Factory-applied anti-friction coating minimizes bore friction, allows tighter piston-to-wall fitment, reduces piston rock noise, and improves wear resistance
• Precision Ring Grooves: CNC-machined grooves feature calculated root diameters and axial widths for superior ring seal and minimized oil consumption and blow-by
• Optimized Valve Pocket Design: Deep, large-format pockets provide clearance for oversized valves and high-lift camshafts without additional machining in most cases

Kit Details:

• Sold as an individual/replacement piston — rings sold separately
• Recommended ring set: W77008-4625-5
• Includes wrist pin: S462
• Wrist pin: .990-inch diameter, tool-steel construction with 0.180-inch wall thickness to limit flex

Wiseco manufactures all forgings in-house at their ISO-certified facility in Mentor, Ohio, applying feature-aligned grain flow technology and advanced CNC machining to produce pistons trusted by professional racers across drag racing, oval track, and endurance motorsports disciplines.