Trying to figure out who is on first.....
Granted there seems to be a large amount of oil flow on the rockers....
..... but let's go back to the beginning of the oiling system.....
The rockers are the lasts step in the oiling process...... first the crank, camshaft and then to the top of the engine where it eventually get dumped in the return channels/holes in the head back to the crank case.
If all the other bearing clearances are tight or at least according to specs. the oil pressure doesn't really start to fall until it reaches the loose rockers...
.... the oil pressure sensor is located early in the oil galleries... then why would it be so drastically affected by a leak further down into the system....
Is there anyway that you can reduce the flow to the rockers to confirm that the looseness of the rockers are in fact affecting the overall oil pressure??? some kind of temporary restriction inside the line...?
If you can confirm that the rockers are at fault it would be relatively easy at this stage to correct before installing into the truck.....
Now some rockers can be bored out and brass sleeves installed... not sure if that is feasible on the 216..... so rocker tubes are new and rockers as is.... it would not be too complicated to measure for clearance.....
When you got your NOS head did it have the full valve train or was it bare....?
If you need rockers I may be able to help you out...... how similar are they between 216 vs 235 vs 261...... 235 and 261 are usually interchangeable but not sure if low pressure 235 would interchange with high pressure 235 rockers
Keep us posted...
Bob
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Bob Carriere....B.T.B
C15a Cab 11
Hammond, Ontario
Canada
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