JE Pistons 379455 FSR Ultra Series Piston Kit Bore Compression - 93mm 10.5 1

The JE Pistons 379455 FSR Ultra Series Piston Kit is a complete high-performance piston assembly engineered for demanding powersports applications. Featuring a 93mm standard bore and 10.5:1 compression ratio, this kit is machined from 2618-T6 high tensile forged aluminum for maximum strength and durability in extreme conditions.

Advanced Features:

• Aligned Grain Flow Technology directs aluminum grain flow around critical piston areas for increased strength
• Lateral gas ports channel combustion gases behind the top ring groove for improved ring seal in boosted applications
• Ultra-thick ring lands maintain ring stability in forced induction and high-horsepower engines
• Thermal Barrier Crown Coating reduces heat transfer to decrease fatigue and improve longevity
• Tuff Skirt coating with moly-based dry film reduces operating friction for better wear resistance
• Accumulator groove traps unwanted gases below the top ring to maintain optimal ring seal
• Double pin oilers provide superior lubrication to the wrist pin and pin bore
• Upgraded 9310 wrist pins withstand additional loads from forced induction applications

This complete kit includes all necessary pistons, rings, wrist pins, and wire locks under one part number. Made in the USA by JE Pistons, a trusted leader in professional racing with over seven decades of experience. The smooth flowing dome design requires no deburring or preparation, making installation straightforward for professional builds and extreme applications.