825 cfm, general competition design (GC), down leg boosters, square flange, Mighty Demon carburetor Running an over-the-top street/strip engine combo with high compression ratio, big cam profiles, large cylinder heads, et cetera? Then you need a radical street/strip carb to match. Demon Carburetions Mighty Demon carburetors are a step up from the Speed Demon. They feature billet baseplates and metering blocks, concentric venturis, replaceable air bleeds, mechanical secondaries, and fuel bowls with sight plugs.