JE Pistons JE-361329 – forged piston set for Subaru EJ257

The JE Pistons 361329 Ultra Series set is aimed at the most demanding builds based on the iconic Subaru EJ257 engines with a 100 mm bore. These pistons are engineered for maximum strength, thermal resistance, and stability at extreme horsepower and high RPM – the ideal solution for motorsport and advanced tuning applications.​

Key features

• Aerospace-grade forged 2618T6 aluminum – provides exceptional fatigue resistance under high boost pressure and heavy mechanical loads.​

• Advanced FSR (Forged Side Relief) design – ensures optimal strength and reduced weight for enhanced performance.​

• Precisely contoured dish/inverted dome (-17.3 cc) profile for compatibility with aggressive camshafts, stroker setups, and EJ20/EJ25 heads.​

• Moly skirt coating – significantly reduces friction and protects cylinder liners.​

• Forced pin oilers – active pin lubrication system improves longevity at sustained high RPM and side loading.​

• JE Pro Seal ring set (1.2 / 1.2 / 2.5 mm) – optimized for turbo engines and E85/methanol operation.​

• Heavy-duty full-floating wrist pins, 23 mm (0.905”) – withstand extreme pressure and temperature in high-power/boost applications.​

Typical applications

• PRO drift, drag racing, Time Attack – builds exceeding 800 HP.​

• High-power street/strip EJ257 turbo and stroker engines.

• Upgrade or replacement for stock pistons in boosted conversions.

Technical specifications

Set contents

• 4 × JE Pistons JE-361329

• 4 × 23 mm wrist pins + locks

• 4 × Pro Seal piston ring sets (1.2 / 1.2 / 2.5 mm)

• Installation guide and JE Pistons recommendations

Installation tips