Why do new main bearing sets come with an extra bearing with oil groove? the stock bearings do not have the oil groove's on both sides on any journal, so which one is supposed to get the grooves on both sides?
It was not just a wrong set, they are all like this, and have no explanation as to where to use the grooved bearing's on both sides of journal.
I ended up using another bearing to have it like it was stock since I was not sure. I was thinking it may go in the front, due to timing belt load, allowing for more oil around that bearing?