Wiseco 40187PS Forged Piston Kit HD TC103 Rushmore 10.5:1 CR 3.937in Bore 106CID

The Wiseco 40187PS is a high-performance forged piston kit engineered for 2015 Harley-Davidson Twin Cam 103 (TC103) engines equipped with Twin Cooled Rushmore cylinder heads. Delivering a 10.5:1 compression ratio with a 3.937-inch (100mm) bore and 4.375-inch stroke, this kit displaces 106 cubic inches and is built to maximize power output while maintaining long-term reliability.

Key Features:

• Forged aluminum construction — manufactured in-house at Wiseco's USA facility for superior strength and consistency
• ArmorX crown coating — applied to the piston crown, ring grooves, and pin bore via a proprietary electrochemical process for greatly increased resistance to wear, heat, and detonation
• ArmorFit skirt coating — self-adjusting dry film lubricant that conforms to the cylinder wall, reducing friction and engine noise without the need to measure clearance
• Dome profile with valve reliefs — provides generous valve clearance to accommodate performance cams and big valves
• 10.5:1 compression ratio — ideal for bolt-on performance upgrades on naturally aspirated TC103 Rushmore engines
• Complete kit — includes forged pistons, rings, wrist pins, and circlips

Wiseco's V-Twin piston line is developed and validated through in-house dyno testing and R&D, making the 40187PS a proven choice for Harley-Davidson performance builders seeking durability and power gains from their TC103 Rushmore engine builds. All Wiseco pistons are proudly forged in the USA.