Wiseco 4730PS HD 1340 Shovelhead Forged Piston Kit 9.5:1 3.497in Bore

The Wiseco 4730PS is a forged high-performance piston designed for the Harley-Davidson 1340cc (80 cu. in.) Shovelhead engine platform. Built to a 9.5:1 compression ratio with a 3.497-inch bore diameter, this piston delivers improved power output and long-term durability over stock cast replacements.

Key Features:

• Forged high-silicon aluminum alloy construction for superior strength and heat resistance
• 9.5:1 compression ratio for a meaningful performance increase over stock
• 3.497-inch (3497X) bore diameter — standard bore sizing
• Engineered specifically for the Harley-Davidson 1340 Shovelhead 80 cu. in. engine
• Optimized piston skirt profile to maximize horsepower and torque output
• Manufactured in the USA to tight tolerances for reliable, consistent fitment
• Kit includes piston, rings, wrist pin, and circlips

Important Notes:

• Oversize pistons require cylinder boring or sleeving to match the specified bore diameter
• Not CARB compliant — not legal for sale or use in California

Wiseco has been a trusted name in powersports performance for decades, producing forged pistons engineered to specific engine applications for everything from street cruisers to all-out performance builds. The 4730PS is a direct fit solution for builders looking to restore or upgrade a Shovelhead motor with premium forged internals.