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The local machine shops only have the line hone machine that goes through all of the main bearing caps. They require that the centerline is both aligned and the same size. The machine they have would delete the rear main seal. I do wonder if it can be done with a lapping bar much like you would...

Well, I cracked open another block and it turns out that nobody's crazy. I just have an anomaly block. The bore with mains torqued on the 2nd block came out at 3.142" and a Std. set of main bearings will work perfectly. I understand the "select fit" but that was to mix and match Std, .013, and...

I will look into that. Thank you. I ordered from summit and haven't looked it up from the nsn

You're not wrong to ask. They are for a 6.2. With a variance of .0035 between bores getting. 0018 tolerance across the board (1-4) just isn't happening. Crazy because the stamp in the oil pan face says #2 across the board but they are all different sizes. The gm manual says they were select fit...

Thanks for the help. The problem is that the bores in the block are too small, not too large. #4 is negative and will not even allow the crank to turn if torqued. I have seen std, and undersize bearings but those refer to cranks that have been ground and are actually thicker bearings to make up...

I could use some help from someone that has rebuilt a 6.2. I'm trying to rebuild the engine from my M1008 and the main bearing diameter are all different sizes. I put the main caps on without the bearings installed and the hole the bearing goes in ranges from 3.1389 (#5) to 3.1424 (#1). The GM...