I'am looking for dimensions to grind a late crank to fit a 21 stud flathead. Need exact numbers by someone who has done it before. How much do you shorten the snout? How thick is the spacer behind timing gear? Also do you modify rear main seal area? On the block? and on the crank? I will be using the 21a connecting rod. (any suggestions on where to get rod bearings?) I will be grinding this myself but have never done this type of conversion on a flathead before. Thanks for your help.
The Jalopy Journal
