CP Carrillo SC7399-4 Forged Piston & Ring Set Subaru EJ20 WRX 92mm 8.5:1 STD

The CP Carrillo SC7399-4 is a complete forged piston and ring set engineered for the Subaru EJ20 WRX / EJ205 engine. Designed for performance builds running higher boost levels or increased power output, these pistons deliver the strength and precision needed to handle demanding forced-induction applications at a standard 92mm bore.

Key Specifications:

• Bore: 92.00mm (Standard)
• Stroke: 75mm
• Rod Length: 130.5mm
• Compression Height: 1.285" (32.639mm)
• Compression Ratio: 8.5:1
• Dome/Dish Height: -8.15cc
• Wrist Pin Diameter: 23mm
• Ring Thickness: 1.2 x 1.5 x 4.0mm
• Set Includes: 4 pistons with rings

Key Features:

• High-strength forged 2618 aluminum alloy construction for superior durability under boost
• Fully balanced to within ±1 gram for smooth, high-revving operation
• Accumulator groove reduces ring flutter and improves combustion sealing
• Dual forced pin oilers deliver increased lubrication to the wrist pin
• Radiused valve reliefs compatible with oversized valves and high-lift camshafts
• Fully CNC machined for precise tolerances
• Wrist pins and pin lock grooves included at no additional charge
• Pin fitting final hone included

CP Carrillo pistons are put through a demanding quality control system and precise computerized machining, making them a trusted choice for engine builders worldwide. The SC7399-4 is part of CP's Sport Compact shelf line, offering an off-the-shelf solution with custom-piston-level features for the Subaru EJ20 platform.