Adjustable rocker arm not drilled for oil hole....
krazykuda That must have been what happened. I bought the car with rebuilt engine in it. Glad I opened it up and happened to see that.
We used to get connecting rods with no squirt hole in the engine line that I worked on... The drill would break easily and then if the machine operator didn't catch it, many got to the engine assembly line...
They would get caught in our short block test as it monitored the oil pattern and they could see the change in the pattern if the squirt hole was not there...
However that was 30 years after these were made and we had better technology available to catch them... Back in those days, they would have test stands on the end of the engine assembly line and would start them and run them for approx 5 minutes...
If we would get a batch of them, we would have the rod machine line bring people up to the assembly line and check all of the connecting rods for squirt holes before we would assemble them until they could give us sorted stock from the machine line...
The problem is 100% manual inspection is only 80% effective... 20% could get through...
That's why it's good to check all of your parts before you assemble them....