The first thought that popped into my head was that the pressure relief valve on the oil pump had stuck. For the valvetrain to survive Drag Week, I modified the oil system on the Hemi to pump a lot of oil, full time, unrestricted, to the heads and rocker gear. In addition to the 4 drainback hoses from the heads, I had installed a Titan oil pump, which is very high volume. Only after the pump was in the motor did I start hearing rumors of stuck relief valves on titan pumps, leaving guys stranded with no oil pressure. . The only solution would be to pull the pan and the oil pump and get it unstuck.

Billet Titan oil pump: