that itybity hole that looks to be an 1/8 (& is OE) & the two overlapping add ons to it are my doing. I did not add any that were closer to the FR than that OE one is as I tried to do this as safe as I could. the other one held 15 psi on a cold pump up but after firing it started boiling the coolant & two sets of subsequent gaskets modded by me the same way did the same thing & I (temporarily) threw in the towel & started on this 360