Carrillo SC7437-1 Forged Pistons Subaru EJ257 WRX STI Stroker 99.50mm 9.0:1

Designed to handle the increased demands of a stroked short block, these pistons deliver the precision fitment, strength, and consistency that CP-Carrillo is known for in both street and motorsport applications.

Key Specifications:

• Application: Subaru EJ257 WRX STI (Stroker)
• Bore Diameter: 3.9175 in (99.50mm)
• Stroke: 83mm
• Rod Length: 130.5mm
• Compression Height: 1.123 in
• Compression Ratio: 9.0:1
• Size: Standard (STD)

Key Features:

• Forged from high-strength aluminum alloy for superior durability under boost and high cylinder pressures
• Computer-designed forging geometry ensures proper grain flow and tight dimensional tolerances
• Dome profile optimized for the EJ257 stroker combination to achieve target compression ratio
• Manufactured in the USA with multi-step quality inspection including magnaflux and Rockwell hardness testing
• Shot-peened finish to relieve tensile stresses and improve fatigue life
• Compatible with CP-Carrillo connecting rods for a fully matched rotating assembly

CP-Carrillo has been a trusted name in high-performance engine components since 1963, supplying both OEM manufacturers and top-level motorsports teams. The SC7437-1 pistons are an ideal foundation for a reliable, high-output Subaru EJ257 stroker build, whether for track duty or a high-powered street application.