Wiseco K1715 HD 1340 EVO Big Twin 10.5:1 Forged Piston Kit .010 Over

The Wiseco K1715 is a complete forged piston kit designed for the Harley-Davidson 80ci (1340cc) Evolution Big Twin engine. Running a 10.5:1 compression ratio with a 3.507" actual bore diameter (.010" oversize), this kit is engineered to deliver a meaningful bump in performance over stock compression levels while maintaining the reliability expected from a USA-made Wiseco forged piston.

Kit Contents:

• 3507X – Forged piston set (89.08mm / .010" over bore)
• 4778/9P1 – Matched ring set for proper ring-to-groove fitment
• Wrist pins and pin locks

Key Features:

• Forged from high-silicon, low-expansion aluminum alloy for superior strength, reduced weight, improved heat transfer, and extended service life
• Diamond-turned CNC finish ensures consistent sizing with zero variation between pistons
• Grooves machined around the top ring lands to reduce detonation and enhance top ring sealing power
• Enlarged valve pockets provide clearance for larger valves and high-lift camshafts
• Ream-fit wrist pin bores deliver a precise, geometrically accurate fit
• Compatible with cast iron, chrome, Nikasil, and boron composite cylinder bore compositions
• Manufactured in the USA at Wiseco's state-of-the-art facility

The K1715 kit is ideal for builders seeking a performance compression upgrade on the 1340 EVO Big Twin platform. The .010" oversize bore makes it a direct choice for engines that have been bored to correct wear, keeping cylinder life extended while taking compression to a higher performance level.