JE-Pistons Kit Sub EJ257 (8.5:1) 100.00mm Ultra Series
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