CP-Carrillo pistons are compatible with oversized valves and high-lift camshafts. Part numbers ending in an “X” are on an X-style forging for additional strength, durability and weight reduction, often geared for high-compression naturally aspirated engines. The X-style has a full-radius dome design, high-performance rings and lightweight wrist pins. CP-Carrillo Pistons represent the highest quality and are engineered for maximum power. Pistons can be ordered with gas ports, skirt coating, ceramic top coating, and stronger wrist pins if desired. Heavy Duty pistons are also available for extreme power situations in specific applications and come with ultra-duty wrist pins.
• Deep valve reliefs accommodate high-lift camshafts
• Larger valve reliefs for +1mm valve sizes
• Custom skirt cam and barrel design
• Accumulator grooves
• High-strength aluminium forgings
• High-performance rings
• Fully CNC machined and balanced to +/- 1 gram; Wrist pins included at no additional cost
• Double pin oilers force-fed from oil ring groove
• Pin lock grooves for easy lock removal
• Pin fitting included
Standard features include:
*All gram weights provided are approximate and for the bare piston with no hardware attached.
- Manufacturer:
- Subaru
- Engine:
- EJ257
- Bore Size mm:
- 99.75mm
- Bore Size Inch:
- 3.927
- Compression Ratio:
- 8.5:1
- Stroke Length:
- 83mm
- Wrist Pin:
- 23mm
- Rod Length:
- 130.5mm
- Bore Oversize:
- +0.25mm
- Compression Height Inch:
- 1.123
- Compression Height mm:
- 28.5mm
- Dome/Dish CC:
- -22.5cc
- Grams:
- 396g
- Ring Thickness mm:
- 1.2 x 1.2 x 2.0
- Rings Included:
- RS1658-3927