Carrillo SCR5477-1 PRO-A Beam Forged Connecting Rod Single 3/8 WMC Bolt Subaru EJ-Series

The Carrillo SCR5477-1 is a single PRO-A Beam forged connecting rod designed for Subaru EJ-series engines, including the EJ18, EJ20, EJ22, EJ205, EJ207, EJ255, and EJ257 found in WRX and STI platforms. This is a single rod (one piece), ideal for replacing an individual rod or completing a custom build.

The PRO-A Beam design delivers a lightweight, aerodynamic profile that reduces rotating mass and improves crankcase windage characteristics — allowing the engine to rev more freely with less internal drag. The A-Beam configuration is Carrillo's lightest offering for this application, making it an excellent choice for high-performance street and competition builds seeking a balance of strength and reduced reciprocating weight.

Key Features:

• PRO-A Beam profile — Carrillo's lightest rod design for EJ-series applications, optimized for windage reduction
• 3/8" WMC bolt — High-strength H-11 tool steel rod bolt rated at 220,000 UTS for reliable clamping force
• Proprietary Carrilloy steel — Chrome, nickel, moly, vanadium alloy meeting all VAR (vacuum arc re-melt) ASTM standards
• Manufactured in the USA from oversized forgings for proper grain flow and guaranteed removal of surface inclusions
• Fully CNC machined with probed critical dimensions to validate dimensional integrity throughout production
• Double magnaflux inspected and Rockwell hardness tested during production to verify heat treatment
• Shot peened finish for enhanced fatigue resistance and surface stress relief
• Sold as a single rod — order quantity as needed for your build

Carrillo has been the benchmark in performance connecting rod manufacturing since 1963, trusted by professional race teams and engine builders worldwide. The SCR5477-1 upholds that legacy with the precision, quality control, and material integrity that the Carrillo name demands.