Re: 21 Stud 37mod
This may be alittle off topic, but, I've only worked on a very few 21 stud engines, including the 37. I don't recommend presuming any modification on these engine, as the internal rotating assy was used for two years in the 36 LB and early 38 21 stud engines. Best left to the people that want to restore the original cars. Late 38 24 stud engines can use all the late cranks and a 4: crank will fit, most of these blocks can be bore to 3 3/16 with some sonic testing, and all the " pieces parts" are available.
Gramps
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