Rocker shaft oil passage?
Are you probing the oil passage, or the rocker bolt hole? Here is an oiling diagram that shows the oil passage off to the passenger's side of the rear most rocker pedestal at an angle. 2 3/4" seems about right since you're probably running into that head bolt. You might remove the entire rocker assembly and spin the engine to see if oil comes out of the passage. It won't be a geyser, but it should be a very noticeable flow.
Are you probing the oil passage, or the rocker bolt hole? Here is an oiling diagram that shows the oil passage off to the passenger's side of the rear most rocker pedestal at an angle. 2 3/4" seems about right since you're probably running into that head bolt. You might remove the entire rocker assembly and spin the engine to see if oil comes out of the passage. It won't be a geyser, but it should be a very noticeable flow.
