Manley Performance Pro Series Connecting Rods for Diesel Engines Forged 4340 ...

Manley Performance Pro Series Connecting Rods for Diesel Engines Engineered for strength, reliability, and race-proven durability , the Manley Performance Pro Series connecting rods deliver premium performance for high-output diesel engines. Built for enthusiasts and professionals who demand maximum strength under extreme conditions. Forged 4340 or 300M Vacuum Degassed Steel — Choose between industry-leading 4340 forgings or ultra-dense 300M vacuum degassed steel for superior tensile strength, fatigue resistance, and consistent microstructure. Race-Proven Design — I-beam geometry optimized for weight-to-strength balance, minimizing reciprocating mass while maintaining rigidity and stability at high RPM and heavy load. NHRA Legal Options — Select SKUs in the Pro Series I-Beam range are NHRA Legal , certified for Stock and Super Stock classes to meet competitive racing regulations. Multiple Weight Choices — Available in Tour Lites™, Lightweight, Standard, and Heavy weight configurations to match rotating assembly requirements and tuning goals. Precision Machining & Quality Control — CNC-machined bores, shot-peened surfaces, and thorough dimensional inspection ensure long life and consistent performance. Whether building a street/strip diesel or a competition engine, Manley Pro Series connecting rods provide the strength, consistency, and certification options needed to push power safely and reliably.