Wiseco 6474ML965 Professional Series Forged Piston SBC LS1 Vortec 5.3L Flat Top -2.2cc 10.25:1

The Wiseco 6474ML965 is a single Professional Series forged piston designed for GM Small Block Chevy LS1 and Vortec 5.3L engine builds. Featuring a flat top -2.2cc dish and a 10.25:1 compression ratio, this shelf-stock piston is engineered for performance street and race applications requiring proven, off-the-shelf reliability.

Key Specifications:

• Bore Diameter: 3.800 in. (96.5mm)
• Compression Height: 1.300 in.
• Wrist Pin Diameter: 0.927 in.
• Dome/Dish Volume: -2.2cc (flat top)
• Compression Ratio: 10.25:1
• Application: SBC LS1 / Vortec 5.3L
• Quantity: Single piston (shelf stock)

Wiseco Professional Series pistons are forged from aerospace-grade 2618 aluminum, then precision CNC-machined at Wiseco's Mentor, Ohio manufacturing facility. The forging process aligns the grain structure of the alloy, delivering superior impact resistance, fatigue strength, and ductility compared to cast or billet alternatives. Wiseco's ArmorGlide dry-film skirt coating reduces friction and helps quiet piston operation throughout the life of the part.

This shelf-stock piston is part of the Wiseco Professional Series lineup — no-compromise components built for serious engine builders who demand custom-level performance and durability.