Reworking the 273 Adjustable Rockers

Mopar Tim said

I always thought that was where they drilled to get pressure in the adj screw, to keep it adjusted.

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Correct on the first part. but the oil is for the pushrod tip and not to adjust anything.

The oil in the lifter is doing the adjusting, once the rocker is adjusted, that has nothing to do with oiling the valve and pushrod tips.