Rod and Main Bearing Clearance Advice

[drdano]

I need some advice.  I've torn my 428 down to fix some issues and upgrade a few things.  While I was in there, thought hell, why not just stick a new set of bearings in there while I've got it all apart. 

Most of the rod bearing clearances are coming out around 0.0025-.003 with a bore gauge, which I think is the ballpark of where I want to be.  However, I've got 3 rods where that clearance is down closer to .0015.  The rod journals on the crank are all very close in size, which leads me to think it's the rods and/or bearings (Clevite CB-760P-30).

What are my options for handling these which are too tight?  The crank is already 30 over, which I think means no undersized bearings, correct? 


Ok, now onto the mains.  All the mains are coming in at .0025.  On #1 however, it is sitting at .0015.  Again the main journals all are very close in size.  Run it at .0015 or should I do something?  These are Clevite MS863P-30 bearings.

[blykins]

If you are confident with your measurements (no Plastigage, but using a bore mic), then a good crank grinder can dust a thou off of the offending journals.   With a crank that's been cut .030", you have no bearing choices to dial it in. 

I'd try and find out where the difference is though...if it's the journal, housing, or bearing thickness.  Typically, crank journals won't vary by more than .0002-.0003" after a regrind. 

[Heo]

Try to swap the bearings around