70’ b-body, 440 with an 833 (1967), 3:55 and a 28” tall tire. The online calculators show I should be turning 2500-2600 rpm at 60mph, I’m turning 3000rpm. I’ve confirmed the cars speed with a gps so not sure what’s up with my combination. What rpm are you folks turning using a similar set up?

Last edited by busboy; 06/13/20 10:24 AM.
Oh yeah, it's a hybrid.....it burns gas and tires!