hey yall...I have been watching alot of Speed lately...and they keep on plugging these demon carbs as an alternative to holly carbs. what do ya'll think? has anyone ever used these...I know boyd coddington uses them, but hes a bit of a tool...

 

Proven to be the best so far on my Bro-in-law's 68 Firebird with a 455. He's had Holley's on it but the Demon just seems to be better all around. Don't know the details about tuneability and parts, I just know it performs better.

 

Do a search over on the mazspeed board. Theres a looooooooong thread about using a demon. They are good carbs, basically a better built Holley.

 

Holley bought Demon, I think.

 

However, they don't make anything a normally NA 12A could ever use...they start at 650 cfm, I believe...

 

and they are cheaper than a holly? could you not change the CFM by jetting differnetly...i have just been thinking lately...i have lightend the car...port matched and pollished the intake, built myself a set of headers...threw away the emissions bullshit why not upgrade the carb...

i suspose the stirling/carl way is the way to go but its all a matter of cash flow...

 

They're cheaper than the better, improved Holley's but not the original Holley design carbs which are also still produced...only one range of Demons have removable venturi to change the CFM rating of the carb, but, again, that starts at 650 CFM, too much for 90% of the street driven NA 12As out there even with a big street port...

 

they make the road demon in 525cfm

 

True, but that is w/o the removable venturi, so that CFM rating cannot be changed. With a little tuning on when the secondaries kick in, it might be usable on a big streetport 12A...

Since you found it, how much does it go for these days?

 

so it sounds like one of these would be great on a streetport 13B then ...

 

With the increased displacement, I think you may be right, but it'd have to be modded like a Holley to work on a rotary for the same reasons you can't simply bolt a Holley on and expect it to work...

 

well i'm not sure about that, i just know they exist. Edit: yeah, only the mighty demon's have replaceable venturis, or so it seems.... and they come in 850 and up.

*leafs through latest summit racing catalog* ( i used to own a Chevelle...)

Road Demon 525cfm, Vac. 2ndaires, Elec. Choke..... $289
Speed Demon 575cfm, Mech 2ndaries, No Choke......$439

theres you go... Road Demons look tiny compared to any of the other demons/holleys i've seen, much smaller fuel bowls it looks like.

 

i'm sure you're right ... simply because nothing good seems to come easy.

 

Man, ain't that the truth, especially when dealing with these cars...

 

yeah, i finally get my car back on the road after a year, and now with a GSL rear, actual working brakes, a new clutch, new front tires and an alignment, and a 5spd trans (up from the stupid SA 4spd).... and the ******* motor pops...

oh well, i might slap a s4 13b in there and throw my dellorto on it, i jest need to get hold of a 13b street (single outlet) header....

*sigh*