Wiseco 6506M815 Toyota 4AG 4-Valve Domed Forged Piston +5.9cc 81.5mm Bore

The Wiseco 6506M815 is a shelf-stock forged sport compact piston designed for the Toyota 4AG / 4AGE 1.6L 16-valve engine. Featuring an 81.5mm bore (0.020" oversize) and a domed crown with +5.9cc volume, this piston is engineered to raise compression ratios into the 10.2?11.1:1 range, making it a popular choice for high-performance street and track builds on platforms such as the AE86 Corolla, Celica, and MR2.

Key Features:

• Bore: 81.50mm / 3.209" (+0.020" oversize)
• Compression Height: 1.208" (30.68mm)
• Dome Volume: +5.9cc (raises compression)
• Compression Ratio: 10.2?11.1:1 (dependent on head cc's and gasket)
• Pin Diameter: 20mm (0.787")
• Stroke: 3.031"
• Rod Length: 4.804" (122mm)
• Average Piston Weight: ~287g
• Anti-friction skirt coating minimizes scuffing during break-in and reduces cylinder wall friction
• Textured dome face improves combustion efficiency
• Specially designed valve pockets and optimized skirt profile for multivalve 4AG head clearance
• Forged from high-strength aluminum alloy using Wiseco's advanced in-house forging process

This is a single shelf-stock piston (part number 6506M815). The complete four-piston kit with rings, pins, and locks is available separately under kit part number K506M815. Compatible ring set: 3208XC; compatible pin: S520 20mm.

Wiseco Sport Compact pistons are manufactured entirely in the USA and are engineered to outperform cast and hypereutectic pistons, delivering superior strength, tighter tolerances, and greater durability in high-performance 4AGE engine builds.