They have a version that takes into account the whole car. We're just using the engine portion. But wallace power calculator says that it would take 720 hp to go 5.97 in the 8th. With a 3100 lb car. Assuming that everything else is working correctly. The wallace calculator is pretty accurate. It says that my Bloomer headed engine make 680 hp. It's been 5.85 at 115.6 and weighs 2930 with me in it.