I was taking apart my Z6 head in order to get it all ready and cleaned up for a good mini-me swap, and saw two plugs at the bottom of the head, one missing and one that I took out, and I have no idea what it is, but I am trying to find out so I can order a new one. It is a Torx bit inside of a 14mm Allen keyhole and I have no idea what it is for, and no diagrams are giving me any leads. Ideas is it may be a oil or coolant plug, or something to that nature, but whatever it is, I need to find a new one to order, if possible. Any ideas? New to cars, Honda's, D series, so it might just be me being dumb, but no clue.