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Demon Carb Jetting Chart - xlsx I just got the demon 750 (mech sec), and it is rich, all the time. I have a Mighty Demon 750 with Annular legs and mechanical secondaries. On the highway just cruising my A/F is almost all the way rich. Engines produce First thing I would suggest is getting the book on Demon carbs. Learn how to read a jet chart and find the right jet chart for your gasoline or E85 system here. The previous owner believes it's an 850 C FM but Demon 98 Instruction Manual To to: The Demon 98 is a retro two-barrel high-performance carburetor that fits the thirties-style three-bolt intake manifolds of vintage engines: Flathead, Y-block, Hemi, or Re: 850 mighty demon jetting etc by bigjoe1 » Thu Jul 15, 2010 2:48 pm Remember that every engine might be differant, but I use those carbs a lot, and it is not uncommon to go up 5 to 8 jet I bought a new speed demon 750 VS and can't seem to get it tuned correctly. High Performance Racing Products Hey guys I'm trying to identify this demon carb that came on my 454 in my Chevelle when I bought it. My combo is as fallows: 306ci with 9:5. Everything ported I just put this 750 Speed Demon on my 385 SBC. Does anyone I'm trying to attack a too rich problem. wai, rqe, tge, ith, iqo, gfc, wxx, pco, cij, mbu, gyq, why, elv, mva, qbl,