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3.800" stroke 1053 forged steel 1 piece rear main seal crankshaft used in post November 1998 HT383 and ZZ383 crate engines. Must be used with 10188688 rod and 10159436 pistons for correct balance. Also used with 12498008 balancer, all 1 Piece rear main seal flywheels or flexplates can be used with this crank. GM's 383 are based on 4" standard bore blocks.