Rebuilt my '61 261 last year and did a very successful break-in run on an engine dolly. Ran the engine 20 hrs in 1 hr increments under no load conditions varying the speed between 1500 and 2400 rpm. Was very pleased with the oil pressure, and vacuum readings throughout the test cycle and the compression check at the end. Drained the oil, stored the engine over the winter and installed it in the vehicle last week. Filled with new oil, got it started at low rpm, checked the instrument panel oil pressure gauge and there was no reading on the gauge!!!!! Put the manual pressure gauge on that was used during break-in, removed the valve cover, restarted the engine, still no pressure, AND no oil to the rockers. Shut the engine down again and just about cryed. What should I do to find the cause of this problem short of dropping the pan. Many thanks in advance for any advise.
