JE Pistons 317211 Forged Piston Kit 107ci Big Bore 3.937" Dome Harley Twin Cam

The JE Pistons 317211 is a complete 2-cylinder piston set featuring 2618 forged aluminum construction with a 3.937-inch bore, dome head design, 1.082 compression distance, and 0.927-inch wrist pins. This 107 cubic inch big bore kit delivers a 10.25:1 compression ratio and includes premium ring set JG1001-3937, wrist pins, and circlips.

Key Features:

• Machined from 2618-T6 high tensile forged aluminum for superior strength and durability
• Engineered, forged, and machined 100% in the USA specifically for Harley-Davidson Twin Cam applications
• Dome features smooth flowing radii requiring no deburring or preparation
• Average piston weight of 350 grams with round skirt design
• Complete engine set includes pistons, rings, wrist pins, and circlips
• Precision ring set with 0.04" top compression ring, 0.048" second compression ring, and 0.111" oil ring thickness

As the leader in forged racing pistons with over 75 years of experience, JE Pistons has been at the forefront of Harley-Davidson piston performance for decades. JE designs are specifically engineered for extreme applications including professional competition.