"Next issue is tapping the inner side of the intake for my omp lines.I have a small press, so the actual drilling should be straight forward, but I'm not sure of the size hole to drill. Anyone know the size of the little barb omp fittings offhand? Thread size? i have an SAE tap and die set, but the second issue is going to be how to tap the threads in that area, curl of the intake looks to be in the way of "T" handle of tap. I suppose I could use an extension, but that makes me nervous (to much play) I don't want to trash my intake. Anyone done this? Any suggestions? Tricks?"
BTW in case it matters it's a one piece side draft intake for a 45 DCOE on a 12a.

 

1/8" NPT is what RB uses. That size is also an easy one to find in the plumbing section of your local hardware/home center store.

 

Much appreciated! I'm on a tight timeline and needed that info.