Ford 4.6L Modular Manley Performance “PRO SERIES” crankshafts designed for the Ford 4.6L Modular engine… Manufactured from a premium 4340 steel forging, these cranks feature either the stock 3.543” stroke or an increased stroke of 3.750”, turning your 4.6L into a 5.0L or larger depending on your bore. 4340 material forgings Multi-step heat treatment process and nitrided for added strength Stress relieved, shot-peened and 100% magnafluxed Micro polished large radius journals (narrowed rod bearings required) Lightened rod journals for weight reduction Counterweights fully profiledLearn More