All King Demon carburetors are three-circuit designs. For better street manners, this will require the tuner to tune both the idle and the intermediate circuits to really dial in these carburetors.
The Demon Tweaks
To address the King Demon side of the carb world, we called the company's carb specialist Doug Schriefer. Barry Grant makes a total of six streetable King Demons ranging in size from 795 to 1,295 cfm. One advantage of the smaller King Demons, according to Schriefer, is that the venturi on the 795-cfm carb is a smaller 1.500-incher with the throttle blades a smaller 1.800 inch. These smaller dimensions combined with an annular-discharge booster create higher inlet velocities that make this larger-flange carb more responsive to throttle and somewhat easier to tune. The 895-, 995-, and 1,095-cfm models follow a similar path with increasingly larger venturis and throttle-blade diameters to maintain this velocity.
Schriefer's first suggestion for making any King Demon more streetable is to add a power valve to the primary side of the carb, which allows you to lean the primary by eight jet sizes. This helps driveability and fuel consumption. The King Demons also come stock with screw-in idle-feed and idle-air bleeds, which makes modifying these pieces much easier.
Another important point that addresses any carb tuning is that the idle-feed restrictor and the idle-air bleeds are intended to work in combination. This means that major changes to one bleed should be accompanied by a change to the other. For example, if you are planning to lean out the idle-feed restrictor by making it smaller, it's a good idea to increase the size of the idle-air bleed as well. This also leans out the idle circuit by adding more air. To enrich the idle circuit with an air bleed, you make it smaller. Schriefer's recommendation is to start your tuning exercise with the idle-air bleeds just because they're easier to access. If you are making major changes, a 0.001- to 0.002-inch change to the idle-feed restrictor should be matched with a 0.006- to 0.008-inch change to the idle-air bleeds. If you find you are making very large changes (0.020 inch or more) consider that there may be other problems leading you to such a radical change. END
Let It Bleed
All Dominator and HP carburetors use standard No. 10-32 UNF threads for the idle-, intermediate-, and high-speed air bleeds. This chart lists the specs for the three current Dominator carbs. A full list of Dominator bleed diameters is listed in the current Holley catalog. Holley offers these bleeds in thousandth-inch (0.001) increments from 0.023 to 0.078 in packages of 10.