Not hijacking your thread, but on your 235 OHV I6, back when I was a teen, a lot of badmouthing was going around the Ford circuits about Chevys and their Babbit bearings....Mains and rods.
Well, in my quest for information associated with my current off time hobby, I got the Wikipedia on the subject of these engines including the Jimmy 270 which was popular with a split exhaust manifold and dual glass pack mufflers and pipes.
Anyway I know that rod and main bearings are copper with a layer of "Babbit" but the distinction between what we do with the metal today, and Ford and others apparently did back then, was to put it in a removable shim.....the insert, whereas GM cast it into the engine block and cap for mains or rod bearing surface for connecting rods. This required a shim, copper as I recall, to be inserted between the crank and rod if wear wore the gap out of acceptable tolerance.....had heard of people using shoe tongue leather for the purpose.
Anyhew I learned something. Another thing I learned was that the I6 was an inherently balanced and smoothest engine design without special tweaking to neutralize the natural occurring harmonics. Said it was one reason for it's popularity. If you have time and are curious, lot of great info online at that site.
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