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Manley Performance

Manley Chrysler 5.7L Hemi Forged Crankshaft - 4.050in Stroke

$1,476.70 $1,431.04 Save $45.66

SKU: M004 191858NB

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Description

Part #: 191858NB

Manley Performance PRO SERIES" stroker crankshaft designed for the Gen III small block HEMI engine. Manufactured from a premium 4340 steel forging, these cranks feature a 4.050" stroke which can turn your 5.7L into a 392 c.i. engine and your 6.1L/6.4L into a 426 c.i. engine. The Manley 4.050" stroke HEMI crankshaft features small block Chevy small journal (2.000") crank pin diameters and widths. This provides taller "side walls" on the crankshaft rod journals for better oil control and reduced windage. Counterweights are profiled for 6.125" connecting rods.

Features:

    • Lightweight Design: Manufactured from a premium 4340 steel forging, gun drilled mains and lightened rod journals contribute to weight reduction and optimize engine performance. Counterweights are fully profiled to ensure precise balance and stability.
    • Enhanced Strength: A multi-step heat treatment process and nitriding enhance the crankshafts' strength and longevity.
    • Micro-Polished Journals: Large radius journals are micro-polished to reduce friction and enhance performance.
    • Rigorous Quality Assurance: Each crankshaft undergoes stress relief, shot peening, and 100% magnafluxing to meet our stringent quality standards.
    • Increase Displacement with a ?Stroker? Crankshaft: These crankshafts feature a 4.050? stroke which can turn your 5.7L into a 392 c.i. engine and your 6.1L/6.4L into a 426 c.i. engine.

Stroke: 4.050 in. - Rod Journal: 2.000 in. - Reluctor Wheel: 58 Tooth - Bobweight: 1730 grams (Not Balanced/Non-Drilled)

This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

MIA's Description

The Manley Performance Crankshaft (MPN: 191858NB) is designed for Chrysler 5.7L and 6.4L Hemi V8 engines. It features a polished finish and is made from 4340 steel. It has a stroke of 4.05 inches, a minimum connecting rod length of 6-1/4 inches, and a connecting rod journal diameter of 2 inches. The crankshaft is internally balanced and has a 1-piece rear main seal style. Key features include 4340 material forgings, multi-step heat treatment process, nitriding for added strength, stress relieving, shot-peening, 100 percent magnafluxing, micro-polished large radius journals, gun-drilled mains, lightened rod journals for weight reduction, fully profiled counterweights, and dual keyed post for supercharger drive pulleys.

Fitment

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Specifications

BrandManley Performance
Part NumberM004 191858NB

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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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