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Bored&Stroked · 10-08-2019, 08:10 PM

I think you answered your own question when you measured the journals - two are at .020 and two are at .030 . . . a miss-matched affair. Now, if the journals are in good shape, concentric, no taper, etc -- then I can see no real issue with running .020 bearings on two journals and .030 on the others. Would I do it this way . . . well 'No' - but I'm a perfectionist and I wouldn't want the "next guy" to see an engine I built done in this fashion.

BUT - with all that said, if it is about spending less money - then you can probably put it together with the two different rod-bearing sizes - as long as the resulting clearances are correct.

On my Soapbox: What is still of concern is that the machine shop obviously didn't measure the crank . . . so what else didn't they measure? Quality machine work and correct clearances are everything in an engine build . . . .

10-08-2019, 08:10 PM	#30
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,067	Re: 8ba rod bearing problem I think you answered your own question when you measured the journals - two are at .020 and two are at .030 . . . a miss-matched affair. Now, if the journals are in good shape, concentric, no taper, etc -- then I can see no real issue with running .020 bearings on two journals and .030 on the others. Would I do it this way . . . well 'No' - but I'm a perfectionist and I wouldn't want the "next guy" to see an engine I built done in this fashion. BUT - with all that said, if it is about spending less money - then you can probably put it together with the two different rod-bearing sizes - as long as the resulting clearances are correct. On my Soapbox: What is still of concern is that the machine shop obviously didn't measure the crank . . . so what else didn't they measure? Quality machine work and correct clearances are everything in an engine build . . . .