Manley Performance Forged Crankshaft 4340 Steel Lightweight Gun Drilled

Manley Performance Forged Crankshaft — 4340 Steel, Lightweight, Gun Drilled High-performance forged crankshaft engineered for race and street engines. Made from premium 4340 steel with gun-drilled mains and lightened rod journals to reduce rotating mass and improve throttle response. Key Features Lightweight design: Gun-drilled mains and precision lightening lower inertia for faster revs and improved acceleration. Durable construction: Multi-step heat treatment and nitriding for superior fatigue strength and wear resistance. Micro-polished journals: Large-radius, micro-polished journals minimize friction and improve oil film retention. Balanced and stable: Fully profiled counterweights ensure precise dynamic balance and reduced vibration. Thorough QA: Stress relief, shot peening, and 100% magnaflux inspection guarantee reliability and structural integrity. Stroker capability: 4.050" stroke option available to increase displacement — convert 5.7L to 392 ci or 6.1/6.4L to 426 ci (stroker application). Why Choose Manley Ideal for builders seeking a proven, race-ready crankshaft that combines weight savings with exceptional strength. Manley Performance delivers consistent manufacturing tolerances and industry-leading quality control for long-lasting performance under high loads.