Any carburetor with annular boosters will have a higher signal to the jets and will use a slightly smaller jet size (like 2 sizes). The demons have
a lot of nice features over the holley like billet metering blocks, large sight glass bowls,
billet throttle bases, and if you get the right carb screw in air bleeds.
The calibration as far as what airbleeds, jets,
emulsion jets, needles and seats, etc is spelled
out very clearly in the DEMON performance book
(info which Holley does not have in printed form
BUT I have never had a tech refuse to tell me
the size of an air bleed or emulsion hole on a
holley. Just more PITA to get the info.
Most Demon will run rich on the street with a normal engine as this is SAFE for Demon to sell.
Some rejetting will be required anyway on any
carb. Jim Hand had to take a couple of jet sizes out of Patrick James carb from Pro Systems.
Tom V.
