I have to pull it a little higher too Greg. I only went to 5135 rpm and the hp was still going up. Also have to pull a valve cover and check the pushrods. The last stock set gave up and bent. I have a bit more spring pressure than the old motor. Interesting too the motor was only using 372 cfm@5135rpm. The f/a ratio was at 12.00 at the end of the pull so I'm going to try and lean it out to 12.5/12.75.