This is prolly a fluke but if someone were to have a problem and I never said anything I would feel bad.
Speed Pro Main brg set 141M standard. Bearing has on back of it 7058 cha.
This particular bearing shell that has something wrong with it happens to be an upper (with the groove). There is nothing visibly wrong....no burr around the oil hole, the tangs are correct. The bearing appears to sit in the main bore correctly.
I don't have a ball mike...but I can't pick up anything with a normal mike that gives me any indication something is wrong.
Putting the bearing shell in the block...measuring with a dial bore gauge.....you get .0035 clearance on the back 1/2 of the bearing....and close to .005 on the front 1/2. Any main brg hole you check.
This only happens with this particular bearing shell.....replace the shell with another and the problem goes away. All other bearings in the set are normal and therefore clearances coming up normal.
It isn't the caps on the block are incorrect or crooked (seen that before) or that the tang is hanging up on the block (ditto) or that there is a burr at the oil hole in the bearing.
No question it is the bearing shell.....just a question of what is the issue with it.
I threw it on top the toolbox and may borrow a ball mike sometime and see if it is a thickness issue or something.
Anyway....assume everything is defective shit. Safer that way.