Why would they take out good rods and put in lighter duty ones? The assembly can be balanced with any rods. Why doesnt this guy know what's in the engine? I personally would pass it up, you dont know what you're buying at all, especially if someone changed parts all around. You dont know what cam is in it now, dont know what heads and chamber size...is there any documentation on what this really is? And where are you going to run a 12.5/1 engine, not on the street for sure...assuming that's what it really is. I would keep looking regardless of the price. If you were spending 500 bucks, that's one thing...but 3K?