I wouldn't worry about if it would work. But why bother? By the time you get them made/machined, you could just buy the right crank and be done with it.

If I remember right MP use to sell them about
25 years ago.. I knew 1 guy the used them.. it
worked out fine for his street engine.. this
was on a SB.. but I havent heard of them in
a LONG time

I appreciate all the responses about this. Fact is, I wanted to know if it’s been done, simple question. Will I do it, probably not at this point, just wanted some input on the subject.

Back in the day, the original bearing was the spacer.

If they were available I'd probably buy a set. I have access to a billet center weighted 400 mained 4.300 crank.

Me thinks your talking about the beginning of times in American made cars

Bill Jenkins 1973

I thought you where talking about the full floating rod bearings back a long time ago that I have heard of, never seen one myself either

Flat head ford stuff.

I only used them in the smallblock Chevy in my offshore boat ,,but that was years ago...Never had a problem..even at high RPM WOT for over an hour at a time..( in flat water) ..or jammin from full throttle no throttle and right back on to WOT ..in big water..

Why stop at that size, go smaller, after all, smaller journals make more HP. It's not some voodoo thing.

Size matters, especially when it comes to twisting and reversing metal repeatedly

You mean like Johnsons rubber cranks Line was complaining about?
Speek get of cranks, go to the general forums and look at the Cummins engine dyno explosion. Had a good one in it, for awhile!