Be wary of using threaded brass or copper into the block with a lot of plumbing hanging off it. I have had brass pipe fracture at the threads near the block from engine vibrations. The threads greatly amplify the stress concentration in the pipe. A rubber hose connection into a nipple would be better.
Thanks FTF! I see lots of evidence online of others having brass nipples shear off due to vibration. I will re-plumb with iron. Better safe then sorry . . .
