I picked up a complete z6 from a friend for $75. He said it knocked but he only drove it a few miles from where it started to his house where he parked it until he put a new motor in. I pulled the pan off and the number 1 rod bearing is definitely bad. Someone told me when a rod bearing goes, you're supposed to have the crank turned. Is there anything I can look for to tell if it needs that? Or from experience, can anyone say if that's true or not? I'd like to just replace the bearings and rings and maybe pistons since this is just my daily driver and I don't really need to invest alot of money trying to make power with it when I have another car that already does that.