Drilling Header Tanks

Today I drilled and tapped the header tanks for the fittings I am planning to install. Pretty straight forward. I had to layout the holes so I would be able to get tools on the fittings. Once I had the layout and holes marked, I drilled them to size and then tapped them with the NPT tap. I also drilled and tapped the output holes at the bottom of the tanks. NOTE the pattern on top of the tanks is opposite for each side.