JE Pistons 315117 Piston Set, 2618, Inv Dome/dish, 3.386 Bore, 1.290 Cd, 0.866 Pin, Set Of 4.

The JE Pistons 315117 is a complete forged piston set engineered for high-performance and motorsport applications. Forged from 2618 aluminum alloy, this set delivers the high tensile strength required for demanding builds running boost, nitrous, or high compression. The inverted dome/dish crown design targets a 10.5:1 compression ratio and features a 3.386-inch (86.0mm) bore, a 1.290-inch compression distance (CD), and a 0.866-inch wrist pin diameter.

Key Features:

• 2618 forged aluminum construction — provides the high tensile strength needed for extreme forced induction, nitrous, and high-compression applications
• Inverted dome/dish crown — optimized combustion chamber geometry for a 10.5:1 compression ratio
• Proprietary Forged Side Relief (FSR) design — reduces skirt width to minimize friction and power loss while saving weight
• Anti-friction skirt coating — reduces wear on piston skirts and cylinder walls while lowering operating noise
• Accumulator groove — helps control combustion gas pressure to reduce ring flutter and improve ring seal for consistent power output
• Engineered and manufactured 100% in the USA using advanced CNC machining technology
• Kit includes: 4 forged pistons, high-quality wrist pins, wrist pin locks, and JE Pro Seal premium piston rings

JE Pro Seal piston rings feature barrel-faced top rings made from premium ductile iron with plasma-moly inlays, combining nickel, chrome, and trace elements for exceptional sealing performance. Every piston set undergoes a rigorous 23-point quality inspection in an environmentally controlled facility, ensuring dimensional conformity and race-ready precision right out of the box.

With over 75 years of forging expertise and a proven record across NASCAR, NHRA, ALMS, and AMA Supercross, JE Pistons remains the benchmark for professional engine builders and high-performance enthusiasts worldwide.