Thanks Go. I re-examined my bearing caps last night with a magnifying glass. Unfortunately there were no traces of any markings on any surface of the caps other than the casting numbers.
Jim Yergin

page 134 of my service manual.
Hope You find something similar. Greetings! Go

Thanks David.
Jim Yergin

I have often found the numeral 3 stamped on the #3 cap but between the bolts, not at the side.  No matter, simply mount the caps in place without the crankshaft and run your finger across the bearing seat where cap meets block. There should be no discernable edge where the two meet. That being the case, mark the caps and proceed.

I'll dig out the magnifying glass and give it another look.
Thanks Chet.
Jim Yergin

Jim,

Look carefully at the cap ends there may be center punch marks left by the last mechanic.? Maybe even a hint of a scribe line.? It's a long shot and something you probably have already looked for but I thought I would throw it out there.

Chet...

I am working on a Plymouth flat head 6 that I purchased already disassembled. It appears that whom ever disassembled the engine did not mark the 2nd and 3rd crankshaft bearing caps so that they could go back in their original places. My factory parts book lists the same part numbers for these caps so I guess looking for different parts numbers on the caps themselves won't work. Is there any way to determine the correct location of each of the caps?
Thanks.
Jim Yergin