All the other crankshaft dimensions on a GMC six are the same from the 228 to the 302- - - -rod and main bearing sizes, etc. I've got a 228 stashed away I can measure in the morning once it gets daylight outside in the storage shed. The 235 is 3 7/8" diameter at the seal surface.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!