I did a full rebuild on my engine over the winter. Im a tech student and did it as part of my class. When the engine was removed it ran fine. Didnt burn oilor anything. I rebuilt it knowing that i had future plans for it and wanted it to be in good condition and wanted something to learn on. I fully rebuilt the engine. New bearings and rings. My cylinders were perfect along with every other part in the engine. I polished the crank and when i was done it looked brand new. I used clevite bearings and plastigauged them. The whole time my instructor was watching over. The cam bearings were replaced. I did not get into the oil plugs. The engine started and ran fine. Ive put nearly 700 miles on it since. i wanted to see how it ran after all my work. After i was done my oil pressure had dropped. anywhere below 1000 rpms the factory tach drops down to nothing. i thought maybe the oil thinned out. so since it was a rebuild i went ahead and changed it. I used supertech 10w-30. I noticed that the oil pressure is fine tell it is warmed up. then anything below 1000 rpms and it drops. im in the process of getting an autometer gauge to really see where the numbers are at. any one have any ideas?