For a 3" main engine it's loose, assuming measurements are correct. Were these measurements taken with plastiguess or a dial bore gauge?
When i built my 4" stroker, I shot for .0025-.00275" on all the mains. I think the rear main came out about .003. I was using a Scat crank with the journals on the small side and the main bores were on the larger side of spec. So I had to use FM 4040M1 bearings, they are .001" tighter than STD.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum.
White '67 LeMans 407/TH350/Ford 3.89... RIP
Red '67 LeMans. 407/TH400/Ford 3.25
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