JE Pistons 391920 FSR Pro Series Piston Kit Bore Compression - 78mm 13.2 1

The JE Pistons 391920 FSR Pro Series Piston Kit is a high-performance forged piston designed for demanding powersports applications. Featuring a 78.00mm standard bore and 13.2:1 compression ratio, this piston kit delivers the durability and performance that racers and enthusiasts demand from championship-proven JE Pistons engineering.

Key Features:

• Forged from premium 2618 aluminum alloy for superior tensile strength in high-demand racing applications
• Proprietary Forged Side Relief (FSR) design minimizes friction and power loss with reduced skirt width
• 78.00mm bore diameter with standard bore sizing
• 13.2:1 compression ratio optimized for maximum performance
• Engineered and manufactured 100% in the USA with over 75 years of racing experience
• Complete kit includes high-quality wrist pins, circlips, and JE Pro Seal premium piston rings
• CNC-machined to exacting tolerances for precise fit and reliability

JE Pistons has earned its reputation as the industry leader in forged racing pistons through continuous innovation and proven performance in professional racing across NASCAR, NHRA, AMA Supercross, and other top-level motorsports competitions. Each piston is specifically engineered for its intended application to provide the ultimate combination of durability, performance, and reliability under extreme operating conditions.