I would like to switch carb on my 408 SB stoker
Has a quickfuel Q-750 double pumper
Wanted a choke and vacuum secondary for better street driving so I bought a Holley 770 ultra street avenger
I'm using a air/fuel meter to monitor things
I was surprised to see the Holey running pig-rich at cruise, like 11.7-12.0. It has 70 primary jets out of the box
I had the QF running at 13.6-13.8 (where my combo likes it at cruise) with 74 jets
I thought perhaps the power valve might have been defective, changed that, no change in the A/F ratio
I'm wondering - is the choke horn creating that much air restriction? Or is fuel getting pulled in from somewhere?
Just seems weird since a lot of people claim the Avengers are too lean out of the box...