There is supposed to be an internal oil passageway for the cylinder head lubrication, but they were prone to getting clogged up and an add-on kit was available to route a line around the back of the engine and supply oil to a 1/8" pipe thread hole in the center of the head casting. No problem doing it that way, it just adds one more external line. It's OK to tap off the same port with all of them. There's no oil flow through the gauge line- - - -it's a pressure port only.
Jerry
Last edited by Hotrod Lincoln; 03/28/2011 6:48 PM.
