[scottj]

There is another formula for sizing carbs; 1.3-1.4 cfm per horsepower on gas and 1.2-1.3 cfm per hp on alky. When you get into application specific modified carbs they refer to carb size as throttle plate dia and venturi dia anyway.

Re: Demon vs. the age old Holleys- I know the Demon is all they write about in the hot rod mags and as a result every other car at cruise night runs one, but they are almost non-existent at race tracks. By race tracks I mean circle and roadracing, which is much more demanding than drag racing when it comes to fuel curve management. At race tracks, Braswells are the standard by which all others are measured. The Holley HP was designed by Dave Braswell to be a production carb with the advancements of his custom modified carbs. The HP makes higher peak power, broader overall power, and has better throttle response than any past Holley. The only 4bbl carbs that meter fuel better than the HPs are the modified HPs and only the good ones. I'm not going to bad mouth Demons, in fact I had a 825 cfm race Demon on the Cobra for 83 street miles and it had good drivability. I also ran the Demon on a circle track car and in both applications a Blake modified 4150(non-HP model) was the same as the Demon and a 4150 HP had better drivability and throttle response than either.
Scott