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Bruce Lancaster · 06-30-2014, 10:11 AM

Look for a forging number on the rods, as there are a number of possibilities with 3 different series of cranks that could swap in...
but of course easiest way is to look at bearing itself, which will be full length of journal supporting two rods if '39 type, typical snap-in halves supporting one rod per pair if late '49-53 types.
91 or 21 rods would indicate 1939 85 type crank, 99 or 29 would be an early 239 crank which will fit into the 221 block, snap-in singles would be '49 up crank...which can also be fitted to earlier motor.

06-30-2014, 10:11 AM	#16
Bruce Lancaster Member Emeritus Join Date: May 2010 Location: Madison, NJ Posts: 5,230	Re: !939 spun #2 rod bearing Look for a forging number on the rods, as there are a number of possibilities with 3 different series of cranks that could swap in... but of course easiest way is to look at bearing itself, which will be full length of journal supporting two rods if '39 type, typical snap-in halves supporting one rod per pair if late '49-53 types. 91 or 21 rods would indicate 1939 85 type crank, 99 or 29 would be an early 239 crank which will fit into the 221 block, snap-in singles would be '49 up crank...which can also be fitted to earlier motor.