Annular Vs. Dogleg Carb Showdown

It's also important to point out that this one test should not be taken as a blanket endorsement of annular-discharge boosters for all applications. In this particular case, the peak power difference was a solid 7 hp, but even more impressive was the 20-lb-ft average torque increase. This illustrates why Barry Grant recommends using the annular-discharge carburetor on any engine with a camshaft duration of 220 degrees at 0.050 or more. What you can expect is that an annular-discharge carburetor would be an excellent choice to improve part-throttle driveability on a street car equipped with a long-duration camshaft and lots of overlap while also promising a slight overall power improvement. Annular boosters could also be a great addition to a slightly oversized carb as a way to improve its part-throttle manners.

Current Speed Demon and Mighty Demon carburetors do not have replaceable boosters like the Race Demon carburetors. But this doesn't mean you have to buy a new annular-discharge carb to take advantage of these boosters. For under $100, you can send your Speed Demon or Mighty Demon back to Barry Grant and the factory will install the proper annular-discharge boosters and matching high-speed air bleeds to make the conversion.

So whether you're looking for a new carburetor for your steroid-induced big-block or just looking for a way to improve the boulevard manners on your street burner, an annular-discharge carburetor might just be the boost your street machine needs.

'Power Play Test 1 used the downleg-booster-version 750 Mighty Demon using a 1.400-inch-diameter venturi and 1111/416-inch butterflies. Best power-jet numbers ended up with 79 and 85s.

Test 2 began with the annular-discharge-booster-equipped 750 Mighty Demon carb and the factory jetting. The annular Mighty Demon 750 uses a 0.250-inch-larger venturi (1.4250 inches) and a 0.0625-inch-larger butterfly (131/44 inches) compared to the downleg carb to compensate for the larger-diameter boosters, though it is still rated at 750 cfm. For best power we ended up with 76 primary and 82 secondary jets to achieve best overall power.