When I changed the cam I also changed the lifters to ones the feed the roller pressurized oil. It killed way more oil pressure than I imagined. I moved from 15W40 to 20W50 and had to run an extra 2 quarts to keep the pan full. That ate up way more power than I gave it credit for. After drag week I restricted the oil to the rockers and was able to go back to my old oil and oil level. The car has run within .02 of its best since then.