Manley 632505C-4 Platinum Series Forged Piston Set Bore Subaru - 100.00mm 0.5mm 2.5L EJ257

The Manley 632505C-4 is a Platinum Series forged piston set designed for the Subaru 2.5L EJ257 engine, featuring a +0.5mm overbore size of 100.00mm with a dish piston design. Built from domestic 2618 high-strength alloy forgings and finished with a moly-coated skirt, these pistons are engineered to handle the demands of high-horsepower turbocharged applications.

Key Features:

• 2618 Alloy Forging – Domestic 2618 high-strength material provides superior tensile strength under boost and high combustion loads
• Moly-Coated Skirts – Reduces friction and wear for improved longevity in performance builds
• Dish Piston Design – Optimized for turbocharged applications, supporting tuner-friendly compression ratios
• Cam and Barrel Skirt Profile – Generates maximum power output while minimizing cylinder wall wear
• Exacting Ring Lands and Grooves – Precision-machined to strict tolerances for enhanced ring seal and increased power
• Premium Chrome Moly Wrist Pins – Included with the set for reliable pin retention and reduced rotating mass
• Pressure Balance Groove – Helps equalize pressure and improve piston stability at high RPM
• Unique Fixturing Process – Skirt turning and ring groove machining performed in a single operation for perfect ring groove-to-skirt squareness
• +1mm Valve Pocket Clearance – Accommodates oversize valves for cylinder head upgrades

Manley's Platinum Series piston sets are trusted by professional engine builders and performance tuners worldwide. The 632505C-4 is the +0.5mm overbore option in the EJ257 Platinum Series lineup, ideal for engines that have been bored to correct wear or for builders seeking a tighter bore fit on a fresh block.