Carrillo SC7405-4 Forged Piston and Ring Set 86mm Bore 10:1 Compression

The Carrillo SC7405-4 is a high-performance forged piston and ring set engineered for Subaru FA20 and Toyota 4U-GSE engines. Manufactured from 2618 alloy aluminum, these pistons are designed for serious performance applications and racing builds where strength and reliability are paramount.

Key Specifications:

• Bore: 86.0mm (3.386 inches) - Standard size
• Compression Ratio: 10.0:1
• Compression Height: 32.8mm (1.292 inches)
• Pin Diameter: 22mm (0.866 inches)
• Piston Style: Flat top with four valve reliefs
• Ring Pack: 1.0mm x 1.2mm x 2.0mm
• Piston Weight: 338 grams each

Complete Set Includes:

• Four (4) forged aluminum pistons
• Four (4) CP 51-series wrist pins
• Four (4) premium CPN ring sets with gas nitrided steel top ring
• Taper hook groove second ring and low tension oil ring

Premium Features:

• Dedicated forgings for maximum strength
• Balanced to within +/- 1 gram
• Accumulator grooves for improved oiling
• Dual forced pin oilers
• Fully CNC machined for precision fitment
• Compatible with press-fit or floating wrist pin configurations
• Made in USA

CP-Carrillo pistons are precision-engineered using advanced 5-axis CNC machining and sophisticated computer modeling to ensure optimal performance. Each piston undergoes rigorous quality control in their climate-controlled inspection facility, ensuring consistent quality for demanding racing applications.

Note: Wrist pin locks are not included and must be purchased separately. OEM Subaru locks are compatible with this set.