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Thanks, I'm looking for specific, I'm pretty familiar with conventional early V8.
That hole runs over to one of the head bolt holes so not sure how that would help.
The 4.0 is a stroked 2.9. Oil flow through the system should be very similar.
On a 2.9, the oil flows up through a passage in the pedestal and through the hollow rocker shaft to the rocker arms. As noted by adsm above, worn cam bearings starve this oilflow before it reaches the pedestal. Also, crud accumulating in the hollow rocker shaft(s) can impede/block oil flow to the valves. If the 4.0 is similar, maybe someone else can chime in.
No passage in pedastal, the only possibility is that because that hole mentioned above is flared out into the pedastal bolt holes that oil is supposed to squeeze around that bolt up into the rocket shaft.
The 4.0 is known for oiling issues at the rockers. That's why the pushrods "football".
Football is the right word
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