Wiseco 4729P4 HD 1340 Shovelhead 7:1 CR Forged Piston Kit 3.537 in. Bore

The Wiseco 4729P4 is a forged piston kit engineered for the Harley-Davidson 1340cc Shovelhead 80 cubic inch V-Twin engine. Delivering a 7:1 compression ratio with a 3.537-inch (3537X) bore, this kit is purpose-built for stock rebuilds and mild performance applications where reliability and longevity are the priority.

Key Features:

• Forged high-silicon aluminum alloy construction for superior strength, durability, and heat resistance compared to cast alternatives
• 7:1 compression ratio — ideal for stock-style rebuilds and low-compression performance applications
• 3.537-inch (3537X) bore diameter — 0.040 in. oversize, requires cylinder boring or sleeving
• Optimized piston skirt design for reduced friction, improved horsepower, and maximum torque output
• Valve relief pockets machined deeper and larger than OEM for improved clearance with modified or high-lift camshafts
• USA-made — manufactured at Wiseco's facility in Mentor, Ohio

Kit Includes:

• Forged piston
• Piston rings
• Wrist pin
• Circlips

Installation Notes: Recommended piston-to-cylinder wall clearance is .003"–.0035" (0.075mm–0.089mm), measured across thrust faces at 90° from the wrist pin hole at the base of the piston. Minimum ring end gap is .004" per inch of bore size. As this is an oversize piston, cylinder boring or sleeving to the appropriate diameter is required prior to installation.