Alright, my engine is in a shop getting put back together, and the new main bearings that I purchased were Standard size for a 3.8L SC'd engine. Now, there trying to put my crank back in, and it fits in the middle 2 mains, but the front and back main bearings do NOT allow any clearance between the crank and bearings themselves. There is NO clearance whatsoever, how can it beat that tight? I do not understand.....