ok i was cleaning on my motor and i noticed there was a engraving on the case next to the crank on the upper and lower peice ...it says TA5 ...i didnt think too much about it but i was looking at changeups spring clean up and noticed there is some engraving from what i can see ....any ideas what this is ?? i was thinking it could be to show it has had the crank mod?? couldnt see any other reason to do this unless hauck did this when they big bored it ?