Reworking the 273 Adjustable Rockers
Agree to disagree. There is so much oil splashing around under the valve cover that everything gets oil. Now if you gave a 8,000+ rpm race engine you might want to make some modifications. Mopar never has had a problem with rocker arm/shaft/pushrod failures with stock engines (100,000+ miles) so oil hole orientation is not an issue unless you want it to be.
We can agree to disagree but that won't make me incorrect. The oil hole orientation is for HYDRAULIC valve gear. As I said, I have never looked at a set of OEM 273 rocker shafts, buy I doubt that Chrysler made the 273 with the oil hole in the correct place, simply because of low production numbers and cost.
What happens is that Most engines have an honest 70, maybe 80 pounds of seat pressure and a cam lobe that is very, very slow and stable, to keep thing s quiet. Then we come along, use 90 to 100 PERCENT MORE spring pressure, with much higher spring rate BTW, and use lobes that are much more aggressive. Then add to that the guys who use a 1.6 rocker which loads the PR cup and adjuster even more. The next thing you know, you are bluing adjusters and cups.
If you are using a roller cam, the loads are SIGNIFICANTLY higher yet.
In the end, the issue SHOULD be corrected. I'm not a big fan of splash oiling. Neither is Chrysler. They don't want to tell you they have screwed us for decades.
Just for clarity, ALL W2 and W5 shafts are drilled with T/A offset oiling holes!!!!! If you actually check them, they are even wrong for T/A offsets, because the holes are radially incorrect. The oil hole never lines up.
As I said, I have published this stuff IN DETAIL on several sites. I have even sent drawings to Chrysler, with details and how far off the clocking is. They will admit, if you call them on it, that it is wrong. They just won't do it publicly. And that is disgusting.