GM LS 4340 Steel Crank 3.622 Stroke 58X Reluct

The EAGLE GM LS 4340 Steel Crank with 3.622 Stroke and 58X Reluctor is a high-performance crankshaft engineered for GM LS-series engine builds requiring precision balance and reliable trigger wheel integration. Built from billet 4340 steel, this crankshaft is internally balanced and features a one-piece seal design, making it a critical component for engine builders seeking OEM-compatible performance in LS engine platforms used in muscle cars, race vehicles, and high-performance truck builds.

The 3.622-inch stroke specification directly impacts engine displacement and low-end torque characteristics, a key consideration for builders tuning engine geometry for specific power band requirements. The 58X reluctor wheel configuration is designed for modern GM engine management systems and aftermarket EFI controllers that rely on accurate crankshaft position sensing. Internal balancing eliminates the need for external balance weights, simplifying installation and reducing parasitic drag in high-RPM applications. The one-piece seal design improves sealing reliability compared to multi-piece alternatives, reducing oil leakage risk under sustained boost or extended track use.

This crankshaft serves engine builders, performance machine shops, and enthusiasts constructing or rebuilding LS engines for street performance, bracket racing, drag racing, or engine swaps. Precision forged billet steel construction provides the fatigue resistance and reliability demanded in high-horsepower applications where stock or lower-grade cranks may fail. LS engine swaps into classic cars, Camaros, Corvettes, and trucks require components meeting strict OEM dimensional and balance specifications—this EAGLE crank is engineered to those standards.

The GM LS platform remains the benchmark for accessible high-performance engine building in the aftermarket, and component selection directly affects reliability, drivability, and longevity. Buyers should verify compatibility with their specific LS variant (LS1, LS2, LS3, LSA, LT-series) and confirm rod length and balancer requirements before ordering. At 60.2 pounds, proper handling and installation by qualified machine shops ensures correct installation torque and clearance verification.