Quote: on a stock stroke 440 based combo, especially in a heavy car, if i were to be inclined to use a downleg booster carb, i'd stick with something that had a 1.425-1.450 max venturi diameter.
it can be a challenge to get a large bore, downleg carb to leave hard with a 3.75 stroke motor in a heavy car. also, sometimes the shift recovery isnt that great either.....although they often make good power on the dyno.
Yep, my Gold Claw is set up w/ the 1.425" venturi / 1.75" baseplate. It made 5-8 HP more on the dyno than my old Holley "950 HP" and was quicker & faster on the track by a comparable amount, too.
I also saw a .2 and 2 MPH improvement on the track switching from a "traditional" Holley 850 to my old Holley "950 HP" and heard from some other people who saw similar improvements w/ the same change. Even though there may not be an outright improvement in HP seen on a dyno, the improvement in shift recovery on the track makes up for it.
