The y block I have came with these hokey external oilers that fish underneath the valve covers and tie into the old rocker shaft oil drain tubes. That have been cut and modified to be the supply side now.

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When they did this they got solder on the inside of the passenger side elbow and it never oiled. This burn up that side. I found a replacement set of rockers but now that I am putting it back together I want to go with a better system for oiling.

I drilled out the head oil passageway gunk with a quarter inch drill bit and tried bolting a grease fitting to see if I could unblock the original oil passageway. That did not work...



So being defeated I have decided to use the external oil system until I am able to go through the motor and get it oiling like it should. I like the look of a different external oil set up I have on another spare engine where the oil goes through the valve cover bolts and the copper line is twice as large, so I will use it instead of the small line running underneath the valve cover gasket that this motor had when it came to me.



One thing that confuses me with this oil set up on my spare motor that uses the valve cover bolts and rocker stand cap is whoever put the motor together used the front two valve cover bolts to install the oiling bolts and rocker pstand caps. On the driver side there is no hole drilled through the rock tube that would allow this oil supply to get into the rocker shaft. Likewise both of the rear rocker stands have the drain tubes yet the passenger side has no hole where it would be able to empty out of the rocker shaft.

Do I need to drill holes so that each rocker shaft has a supply and an exit for the oil? Or can I just use the holes that were originally for the drain tubes as my supply and let the exit be just the small holes that lube the rockers themselves?

Thank you for any advice on this as I am pretty green to these y blocks.