Re: 221/239 cranks
Just to make things clear. From Late 38. up, all crankshafts will fit. However, in the early blocks you may not be able to use the rod assemblies. For the 36LB thru early 38 the 2.398 main blocks, you have to modify the 2.498 cranks.
Yes, you can put a 4" Merc crank in a 36 LB block, but it aint easy$$$$
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