O-320 Main Bearing Shell Part #

[Andrew Maschmedt]

Hi folks,
I am doing a bulk strip of my O-320 which will one day end up in my 6a. The main bearing shells have a part number 68763 which appears in the parts catalog etc., but it also has a suffix just below it "B".
Does anyone know what the "B" stands for?

Thanks for your help

Andrew M

[mahlon_r]

Manufacturing mark of no consequence.
'The opinions and information provided in this and all of my posts are hopefully helpful to you. Please use the information provided responsibly and at your own risk.?

[Andrew Maschmedt]

I had wondered if it was a size grading within a size range. It's something we do in the automotive industry.

Mahlon, thank you for the information, I appreciate it.

Andrew M