I got an 04 F450 6.0. Came in with popping out intake. Found bad roller lifter caused excessive valve lash and roller was mushroomed in bore. Dropped short block in it and heads due to coolant in cylinder 7. While its apart put egr cooler and oil cooler. Finished puuring truck together on Saturday. Cranked forever and no start. Checked Icp and 0 psi removed oil filter and no oil at filter. Oil pressure gauge on dash not showing pressure. First time taking engine apart, has anybody seen this before? Any suggestions?