Wiseco K1608 Forged Piston Kit 74ci 9:1 Compression .030 Over 3.467in Bore Panhead Shovelhead Big Twin

The Wiseco K1608 is a complete forged piston kit engineered for 74 cubic inch (1200cc) Harley-Davidson Big Twin Panhead and Shovelhead engines. This kit is sized at .030-inch over, delivering a final bore diameter of 3.467 inches with a 9:1 compression ratio domed piston design optimized for improved flame travel and combustion efficiency.

Kit Contents:

• 2 forged domed pistons with coated skirts
• Piston rings — Hastings-style X-Ring package: .062" top ring, .062" compression ring, and .158" oil ring
• Chrome wrist pins (piston pins)
• Retainer circlips

Key Features:

• Aerospace-grade forged aluminum construction — forging compresses molecular grain structure for superior strength, impact resistance, and fatigue durability compared to cast pistons
• High-silicon aluminum alloy — delivers long service life and consistent dimensional stability under thermal cycling
• Coated piston skirts — reduce friction and promote smooth cylinder bore operation
• Domed piston crown — engineered dome profile supports improved flame travel for efficient combustion
• Proper installed clearance — each piston is designed to produce maximum power, minimal wear, and an optimal seal at operating temperature
• Dedicated forging per application — superior strength-to-weight ratio with application-specific skirt shape and profile for bore stability
• Made in the USA — manufactured at Wiseco's state-of-the-art facility using 3D design techniques and finite element modeling

Wiseco is the only U.S. aftermarket piston manufacturer that produces exclusively forged pistons, making the K1608 kit a trusted choice for classic Big Twin engine rebuilds and performance upgrades. The complete kit eliminates the need to source components separately, providing everything required for a top-end rebuild.