Wiseco 4012P8 HD Pan/Shovelhead 9:1 CR 3.517 In. Bore Forged Piston Kit

The Wiseco 4012P8 is a forged piston kit engineered specifically for Harley-Davidson 74 cubic inch Panhead and Shovelhead V-Twin engines. Featuring a 3.517-inch (89.33mm) bore and a 9:1 compression ratio, this kit is designed as an oversize replacement for engines requiring a bore and hone, delivering improved performance and long-term durability over stock components.

Key Features:

• Forged in the USA — engineered, forged, and machined at Wiseco's facility in Mentor, OH
• Aerospace-grade aluminum forging — the forging process aligns grain flow and compresses molecular density for superior impact and fatigue resistance
• High-silicon aluminum alloy construction — maximizes strength and thermal stability under high-performance V-Twin conditions
• Optimized piston skirt design — improves horsepower and torque output across the RPM range
• Manufactured to tight tolerances — engineered specifically for the Panhead/Shovelhead engine platform for a precise, reliable fit
• Complete kit — includes piston, rings (3517X ring set for 89.33mm bore), wrist pin, and circlips
• 9:1 compression ratio — suited for performance rebuilds on classic 74 cu. in. H-D engines

Important: This is an oversize piston. Installation requires cylinder boring and honing to the appropriate 3.517-inch dimension. This piston is part of Wiseco's Classic Forged V-Twin series, which draws on over 80 years of motorsports piston manufacturing experience to deliver race-proven performance for street and custom builds alike.