Wiseco K496B125 Professional Series BBC Quick 8 Forged Piston Set 4.625 Bore

The Wiseco K496B125 is a Professional Series forged piston set designed for the high-output Big Block Chevy (BBC) engine platform.

Wiseco's Professional Series represents the company's no-compromise offering for serious racers and engine builders. These pistons are forged from 2618 aircraft-grade aluminum alloy and feature fully machined crowns, making them significantly more robust than cast or 4032-alloy alternatives. Wiseco's 80+ years of experience in high-performance piston development — spanning Formula 1, NHRA Pro Stock, Moto GP, AMA Superbike, and Supercross — is reflected in every detail of this design.

Key Specifications:

• Bore: 4.625 in.
• Compression Height: 1.120 in.
• Pin Diameter: 0.990 in.
• Dome Volume: +15.6cc
• Valve Angle: 18 Degree
• Compression Ratio: 15.9:1
• Application: Big Block Chevy (BBC) 638 cu. in.

Key Features:

• 2618 Aircraft Alloy Forging: Provides superior strength and fatigue resistance compared to 4032 alloy, especially under detonation conditions in forced-induction and nitrous applications.
• Precision Valve Pockets: Engineered to maximize airflow around the valve, accommodating oversized valves and high-lift camshafts without clearance issues.
• Optimized Piston Crown: Dome profile promotes maximum intake charge efficiency and cross-flow scavenging during valve overlap for peak power output.
• Precision Ring Grooves: Machined to exact tolerances for superior ring seal, minimized blow-by, and reduced oil consumption.
• Complex Skirt Profile: Reduces friction while maintaining bore stability for optimal ring seal and long-term durability.
• ArmorGlide Skirt Coating: Wiseco's proprietary dry-film lubricant reduces piston-to-bore friction, allows tighter piston-to-wall clearances, and minimizes piston rock noise for a quieter, more efficient build.
• ISO-Certified Forging Facility: Manufactured in Wiseco's US-based facility using advanced grain-flow forging technology for consistent, race-proven quality.

The Wiseco K496B125 Professional Series piston set is the choice of elite engine builders who demand uncompromising performance from their Big Block Chevy race engines. Rings and wrist pins are included in the kit; verify ringset specifications for your specific bore and application.