Warranty Block?

I forgot the lower shell of the #4 main bearing on a 318. Oil pressure never got above 30 and never under 4..shut her down after it stopped at 4 for about 5 seconds. It ran great for the 5 minutes I was watching it. I literally looked under the car and saw it laying on the ground. I installed them with the crank in the car using a heavy paper clip in an oil hole to push the bearing shells into the block side. Wont try that again! Ran like a top after that, oil pressure never got under 20 even at idle.