Carrillo SCR5303-4 Pro-H 3/8 WMC Bolt Connecting Rods Nissan/Datsun L-Series 4-Cylinder

Manufactured in Irvine, California, these performance connecting rods are built to handle the demands of high-output and forced-induction builds while maintaining precise dimensional tolerances.

Key Features:

• Pro-H Beam Design — Optimized H-beam profile delivers an industry-leading strength-to-weight ratio for high-performance and racing applications
• 3/8" WMC Rod Bolts — Custom-designed Carrillo WMC fasteners included; center-to-center length of 5.235 inches (133 mm)
• Proprietary Steel Alloy — Forged from a chrome, nickel, moly, vanadium alloy that meets VAR (vacuum arc re-melt) ASTM standards
• Oversized Forgings — Manufactured from oversized stock to ensure proper grain flow and removal of any surface inclusions generated during forging
• Mar-Aged Heat Treatment — Heat treat process yields a UTS of 195,000 psi with a yield strength of 182,000 psi while preserving low notch-sensitivity and ductility
• Multi-Step Quality Inspection — Each rod is magnafluxed at least twice and Rockwell tested to validate heat treatment; CNC probing confirms dimensional integrity
• Shot Peened Finish — Final shot peen operation improves fatigue resistance for long-term durability
• Moly-Based Fastener Lubrication Included — CP-Carrillo moly-based lubricant included for proper bolt installation torque

Each SCR5303 rod weighs approximately 555 grams total, with a rotating weight of 404 grams and a reciprocating weight of 151 grams. Note that big-end or small-end honing may be required to ensure proper fitment depending on individual engine journal and pin dimensions. Made in the USA.