Carrillo SC7423-4 Forged Piston Set for Subaru EJ257 WRX STI 100.5mm 8.2:1 CR

The Carrillo SC7423-4 is a high-performance forged piston set designed for Subaru EJ257 WRX and STI turbocharged engines, featuring superb ring seal, higher vacuum, lower blow-by, greater durability and increased horsepower and torque through the power band. These 100.5mm forged pistons offer an 8.2:1 compression ratio, ensuring maximum power and performance.

Construction and Manufacturing:

• Manufactured from high-strength 2618-T61 aluminium alloy forgings offering excellent durability under high heat and high cylinder pressures, making it ideal for boosted and high-performance sport compact engines
• Lightweight forgings with CP's exclusive machining techniques and processes
• Fully CNC machined and balanced to +/- 1 gram
• Accumulator groove included for improved oil control
• Double pin oilers, force fed from oil ring

Complete Kit Includes:

• Forged pistons, high-quality piston rings, wrist pins (gudgeon pins), and locks
• Performance ring pack matched to the piston design ensuring maximum sealing and reliability in high-load environments

Optional Upgrades:

• Wrist pins can be upgraded to stronger 9310 steel pins recommended for high-boost, high-RPM, or nitrous applications
• Optional top and skirt coatings available to reflect heat and reduce friction

CP-Carrillo maintains some of the highest quality control standards in the industry and is a division of Pankl Racing Systems, a high-technology racing group supplying engine components to numerous Formula One, F3000, IRL, CART, World Rally Racing teams and to elite companies like Ferrari and Porsche. Proper piston-to-wall clearance, ring end gaps, deck height, and pin fitment must be verified during assembly to ensure maximum performance and longevity.