I know about the oil delivery problems to rocker arms when the oil passages are blocked with sludge. Back in 1964 I worked in a service station and y-blocks were common then.(I know that I am dating myself) I would see copper lines routed to the valve covers for oiling. Never was interested enough to check where they got their oil supply. Did this work ok enough to get you by until a rebuild if you have rocker oiling problems? This is just for information.
Elmo

 

Yeah, the outside oilers worked as long as the rocker shaft and arms are not plugged. The oil galley runs along the driver side of the engine, a few inches up from the lower block edge. Any of the plugs that go into the galley should work.

 

You are old Elmo.....
We would do the same thing a couple of years/decades ago.
Seems the oil passage from the cam bearings would also sludge up. We'd remove the rockers and shaft (here's where the memory gets fuzzy) and either have a tool to force grease down the feed hole or had a tool to hit with a hammer to clear the feed hole.

 

I found this picture of a kit on the Bangshift web site.

 

The "kit" I was thinking about, had a hollow stud that replaced the rocker shaft/ valve cover hold down stud. Had an opening to let oil into the rocker shaft. No drilling of valve cover needed.

 

https://www.ford-trucks.com/forums/7...-61-292-a.html

 

They tap into the block at the oil pressure sender. At least mine did.
Worked great until one of the tubes sprung a leak and pumped all of the oil out onto the road......connecting rod came out next. I'll never use them again.

 

They are band-aids at best. If your engine needs this then it needs a lot more than this. If it hasn't been getting oil to the top, valve train components are shot, dist drive gear has not received any oil or the timing chain.
Like I said its a Band-Aid and I would never use them

 

True, a band aid but back in the day.....it was easier to sell a customer an oiler kit than an engine tear down. Of course the oils were different back then.