Carrillo SC7422-4 Forged Piston and Ring Set 99.75mm Bore 8.2:1 Compression Ratio

The Carrillo SC7422-4 is a complete forged piston and ring set designed for high-performance Subaru EJ257 engine builds. This set includes four precision-engineered pistons manufactured from high-strength 2618-T61 aluminum alloy forgings, providing exceptional durability under high heat and elevated cylinder pressures found in turbocharged and modified applications.

Key Specifications:

• Bore: 99.75mm (3.927 inches) - 0.25mm oversize
• Compression Ratio: 8.2:1
• Compression Height: 1.208 inches
• Stroke: 79.00mm
• Rod Length: 130.5mm
• Piston Style: Domed design with four valve reliefs
• Top Ring Thickness: 1.2mm
• Material: Forged aluminum 2618-T61 alloy

Complete Kit Includes:

• Four forged pistons with domed crowns
• Matched high-performance piston ring sets
• Wrist pins (gudgeon pins)
• Locks and clips

CP-Carrillo pistons are manufactured using advanced forging techniques and precision CNC machining processes at their Irvine, California facility. Each piston features optimized ring seal characteristics for higher vacuum, reduced blow-by, and improved power delivery throughout the RPM range. The lightweight forging design combined with CP's exclusive machining techniques ensures maximum performance and reliability in demanding forced-induction applications. Professional installation with proper piston-to-wall clearance verification is required.