SO I pulled my motor due to wierd noises. Here are some pics of the 2,3 4 crank bearing and #4 rod bearing caps. You can see copper in the mains and the rod bearing isn't worn in the middle, only the sides. So to you guys who build or have built engines, what causes this? I had the motor rebuilt 4 years ago, but it only has 1000 or 2000 miles on it. Should I pull the motor apart and drop it off for machining or just throw new bearings in it? What have you guys paid for going through a short block?