Your HP computed from your vehicle ET is 483.36 rear wheel HP and 537.06 flywheel HP.
Your HP computed from your vehicle MPH is 500.81 rear wheel HP and 556.46 flywheel HP.


Running a 4 speed and launching at that weight to run those times takes a beating. You really need to do some deep checking to see if you have a main cap issue, thrust bearing clearence incorrect or bent crankshaft. Other issues can also cause your dilema.


Just noticed you say engine has been together for 7 yrs. Did you do any anual inspections? If it went 7yrs of racing on the same build without checking the bottom end, then you actually did very excellent. Parts do go bad after abuse