You mentioned earlier last week you only had .0007 or so main bearing clearance. That is way too tight. To give you an idea of how little clearance that actually is, take a human hair and split it into 5 equal thicknesses, then take one of those split pieces and split it in half again.....Also, putting studs in the block will make the main housing bores close up even tighter than when you checked it and only had .0007" clearance, so you may have close to no clearance at all right now, thats why its so tight. You also mentioned "unoiled" bearings, did you install them dry....
