Carrillo SC7420-4 Forged Piston and Ring Kit 99.5mm Bore 8.2:1 CR

The CP-Carrillo SC7420-4 is a complete forged piston and ring kit designed for Subaru EJ257 turbocharged engines.

Key Specifications:

• Bore: 99.5mm (3.917 inches) - Standard size
• Compression Height: 1.208 inches
• Piston Material: 2618 forged aluminum alloy
• Stroke: 79.0mm
• Rod Length: 130.5mm
• Piston Head Volume: +21.00cc
• Wrist Pin Diameter: 0.905 inch (23mm)
• Wrist Pin Style: Press-fit or floating

Premium Features:

• Deep valve reliefs accommodate high lift camshafts and oversized valves
• Accumulator grooves for enhanced oil control
• Dual forced pin oilers fed from oil ring groove
• Custom skirt cam and barrel design for optimal cylinder wall contact
• Fully CNC machined and balanced to +/- 1 gram
• High-performance ring package included
• Wrist pins and retainers included
• Pin lock grooves for easy installation and removal

CP-Carrillo pistons are manufactured using proprietary tooling and state-of-the-art 5-axis CNC machining in a climate-controlled facility. Each piston is engineered using sophisticated computer modeling for optimum strength, durability, and performance. Optional skirt and ceramic top coatings are available for extreme applications. Note: No pin locks supplied - use factory locks.