Some years back, when I was gathering parts for my 496 (all forged internals, big hydraulic roller cam, Brodix aluminum heads, etc.), I bought a Mighty Demon 850 cfm 4bbl. No choke, double-pumper, recommended as part of a 600HP build in a hot rod magazine.
I had always used Holley 4bbl carbs, double-pumpers in my road race Corvette and my L-88 clone 427 street Corvette, and the original carb that came on my 66 Chevelle SS396 and my 67 Corvette 427. So now I am rethinking my original purchase maybe get a Holley HP850 cfm double-pumper instead.
Anybody have experience with the Demon? Better yet, Demon versus Holley? Power? Good street manners? etc.
I have had my 650 cfm Demon on my 355 sbc in my Canso SD for 9 years and have had no problems with it. It works flawlessly and was very easy to initially set up with vacuum guage (4 ports for vacuum setting). My 2 cents worth.
I am not a serious racing guy, had a 283 with a stock Rochester 4 GC that I could never get to work good. Never had a Holley (other than a 3.9 87 Dakota with a 2 barrel, but I'm sure that doesn't count) and someone who knew his stuff suggested a Quick Fuel. I got one and it worked perfect right out of the box. It also takes all the Holley parts, but looks very well made with a lot of billet stuff.
Don
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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC. 1963- Pontiac top selling car in Canada
Mahone Bay, NS Still not old enough to need an automatic
They all make us happy when they work, they all make us mad when we get bad fuel and plug them up I had a holley 650 on my small block and have a 850 quick fuel on my big block both work great and have friends with the demon that swear by them. I believe demon and quick fuel are made by former holley employees.
1956 Pontiac Pathfinder 2dr sedan, 496 - dyno'd 545 hp, stick shift, 4.11 posi - Hot Rod