Originally Posted by gatekeeper5753
if I do all of this and have no oil coming up to the rocker arms what do I need to check??
If you don't have oil at rockers, you have one of two problems,
The first would be bad/plugged up lifters.
Very little oil will get pushed to rockers from the oil pump,
Everything would have to be aligned just right for any oil to make the lifters from pump pressure.
Most of the time,
Oil is pumped to the lifters, When the lifter is compressed by the camshaft lobe, oil is pushed up the pushrods to the rockers.
Now, with really worn rockers, the socket for the pushrods WILL NOT allow the oil to pass the rocker.
Flip a dry rocker or two, see if the 'Wear Ring' in the pushrod socket intersects the oiling hole in the rocker.
If the wear ring has intersected the hole, time for new rockers and pushrods.
The ball on the pushrod is plugging the hole during the compression cycle.
If the wear ring is surrounding the oil hole in the rocker,
The pushrod *Should* deliver oil to the rocker.
Pushrods/lifters will plug up if oil isn't changed regularly.
There are some VERY tight tolerances in rockers, and they plug easily.
The next thing to check is for leakage (Wear) in older engines,
And in fresh engines make sure the oil gallery plugs used in the front end of the block weren't too long and are plugging the galleries.
Most people reuse plugs, but once in a while plugs are replaced and are too long.
Front camshaft bearings wear out REALLY QUICKLY,
Tugging from the oil pump, timing set, fuel pump drive all hanging off the in-supported camshaft snout wear the crap out of the front bearing,
And that front bearing will dump a load of oil volume, dropping pressure to every bearing in the engine, along with starving the lifters/rockers.
Since there aren't details posted, I'm just throwing out common causes...