I think I may have confused you. Sometimes I confuse myself, lol. The steel line that runs behind the lifter side plate is a factory installed line. Apparently it was a copper line from the 1930s on through maybe the early 50s, steel after that up to 58. 59 to 63 no line at all. It pulls oil and pressure from the rear cam bearing and supplies it to the rockers through a port in the block (about middle to of block). If you look closely at the photo of the 261 with the line you can see how it is routed. if that rear cam bearing became really worn, you would not get much pressure from that port as all of the pressure would bleed off around the worn rear cam bearing. If the line got clogged (very very common especially in motors that had a lot of miles and no oil filter) you would get no pressure or oil to the rockers through the clogged line so the after market oil line kit was one way to get oil to the rockers. It was a copper line that you ran from the oil light sender port (also oil filter supply) generally around the back of the valve cover and then into the port on the side of the head (little hex head plug. You remove the plug and its a direct feed to the rockers). Take a look at the instruction sheet in the post with the photo of the after market oiling kit.
Last edited by Dragsix; 11/26/2018 6:51 PM.
