Got Holley truck avenger 770 with vac secondaries on a 383. I swapped cams to get about 1000 more RPM than I had before. I was running #74 jets (came that way from the factory) and last night I rejetted up 3 sizes to #77's. Think that was a good move? I know everyone says to look at the plugs to tell, but it doesnt see WOT all the time, trying to tune for maximum HP.
Any rules of thumb to go by with jetting?
Any rules of thumb to go by with jetting?