Hi guys just got my block back from the machine shop. So I started measuring bearing clearance and I am a little worried about the variance from front to rear. Here is what I get #1 main .0022 #2 main .0024 #3 main .0025 #4 main .0023 #5 rear main .0027 average .0025 I am ok with .0025 average but I am concerned with the .0005 variance front to rear and #1 being so tight is this normal to see this type of variance? I have rechecked it with two sets of standard bearings and got the same results. I could get a set of xk bearings this would allow me to mix lowers to increase clearance on the tighter caps by .0002 per bearing half. But the front #1 would need both halves of the xk to make .0026 #2 lower xk .0026 #3 leave alone #4 lower xk .0025 and leave alone. I have heard its ok to mix some but would this be ok? Or am I just being to anal about this? This is a bbc bracket engine 468 with 7000 rpm redline around 600 hp. I just dont want to put it together and spin a bearing first time out or even 1 year in I want it to last a few seasons. Sorry for the long post.