The Stovebolt Site Forums The Shop Area Engine Shop 261 oil flow diverter plug in block

I think the part of the 1960 manual that Matt refers-to is the illustration that I posted a link-to in my post above.

My 1959 261 does not appear to have the low-pressure oil-system plug to the left of the forward 1/2" hole for the full-flow oil filtration system.