Carrillo SC7426-1 Forged Piston and Ring Set Subaru EJ257 99.75mm Bore 9.0:1 CR

The Carrillo SC7426-1 is a high-performance forged piston and ring set engineered for Subaru EJ257 turbocharged engines. This complete kit features precision-machined pistons manufactured from high-strength aluminum forgings, designed to withstand extreme boost pressures and high-horsepower applications.

Key Specifications:

• Bore: 3.927 inches (99.75mm) - oversize +0.25mm
• Compression Ratio: 9.0:1
• Compression Height: 1.208 inches
• Rod Length: 130.5mm (stock)
• Stroke: 79mm (stock)
• Piston Style: Dish with four valve reliefs
• Pin Diameter: 0.905 inches (23mm)
• Piston Head Volume: -14.50cc
• Ring Pack: 1.20mm x 1.20mm x 2.00mm

Performance Features:

• CNC machined and balanced to +/-1 gram for optimal performance
• Deep valve reliefs accommodate high-lift camshafts and oversized valves (+1mm)
• Accumulator grooves and double pin oilers for enhanced lubrication
• Gas-nitrided steel top ring for superior durability
• Wrist pins, retainers, and complete ring set included
• Compatible with press-fit or floating wrist pin configurations
• Custom skirt cam and barrel design reduces friction

CP-Carrillo pistons are manufactured using sophisticated computer modeling and 5-axis CNC machining in climate-controlled facilities. Each piston undergoes rigorous quality control inspection with computerized equipment to ensure precision. These pistons are capable of handling over 1000 horsepower when paired with upgraded 9310 steel wrist pins and proper tuning, making them ideal for turbocharged, supercharged, and nitrous oxide applications.