BradH, What calculator did you use? The one I have always used here
https://robrobinette.com/et.htm shows you needing 740FWHP to run a 10.5. I used to use the Moroso slide rule , but nobody I knew ever seemed to agree if it was actual RWHP or engine HP you were using to calculate E/T LOL
Seeing your numbers gives me hope that 675+ FWHP in my E body that weights hopefully under 3550 race weight could run a high 9.
I use the "Quarter Mile HP" calcuator there, which generates #s identical to my Mr. Gasket Hot Rod Calculator. I've always believed it's flywheel HP, since the #s are right in line w/ Dwayne Porter's dyno where my engine was tested the last two times. However, those engine dyno #s could be very different for the same engine run on a different dyno, so they're only relative to THAT dyno, IMO.
You can't estimate HP from ET. I can have a totally hosed 60-ft due to tuning issues, but the car will still MPH pretty much the same. The ET for any given MPH is an indicator of how well the chassis, converter, etc., are sorted out. The MPH tells you how much "oomph!" the engine is making to push a car that weight to the observed MPH. NFW my car made anywhere near 700 HP, regardless of what that HP for ET calculator claims.
