I've never had an engined dynoed. But ive always said car weights this much car should run this number with this mph and this 60. And going by those numbers to guess at a horsepower. Or vice verse with the desk top dyno. Desk top dyno said I was making 650 horsepower. Had a 3600 lbs b body ran 10.80 - 10.90s. I would say that was pretty close.