Never heard of bearings walking due to oil pressure either, but I saw it at a "reliable" source, forgot where. I'll post back if I can find it again. Thought I'd ask you guys if anyone knew about it.
I think I'll have my local shop do the bearings, they can also put the block through their washer. Beats scrubbing it down manually.
I may have found a decent machine shop. They did the head and crank for me. I get a small discount and it seems the dump I work at will start using them too. Just yesterday got a 4 cyl Kia Optima head back from our regular shop, I sent it there for pressure test, straightness and whatnot after the car blew a head gasket. They shaved the head, but never removed the valves. As a result, most valves on one side (16v) got shaved a little too
Never heard of anyone milling the (aluminum) head without removing the valves... Oh well. It runs ok, just got it back together tonight. Fingers crossed. More test driving tomorrow.
Sorry for rambling off-topic, I'm lonely, bear with me
