This is going to be a stupid and very simple question, but i'm in the final steps of finishing my car and i'm a little confused. On the front of a DET block, next to the dipstick there is two open ports tapped into the block. Because when I got my block there was no motor i'm not sure if the very top one is the water return and the bottom one the oil feed. I think?. thx for the help.

anyone??