demon carb identification

[All4rocks]

anyone help me identify this Demon carb? i googled it but still cant figure it out. I believe the guy told me it was an 850. It came on a 472" Hemi i have. I dont need it anymore.

 

[beanhead]

Looks like the old pre-Holley Mighty Demon. It should not have adjustable emulsion bleeds in the metering blocks; I think that feature was on on the Race Demon and higher models.
Looks like '56' by the secondary choke horn, which was the 850. (1.56 venturi).
You can verify the rated cfm size by measuring a venturi and a throttle blade.

 

[oldkimmer]

What’s the numbers on it? Kim

 

[All4rocks]

The 56 stamped on the secondary choke horn and the 175 stamped into the bottom of the blades is all there is.

 

[beanhead]

56= 1.56 venturi
175= 1.75 throttle plates
That's Demon's 850 cfm

 

[All4rocks]

56= 1.56 venturi
175= 1.75 throttle plates
That's Demon's 850 cfm

So it’s an aluminum mighty demon with mechanical secondary’s?

 

[beanhead]

So it’s an aluminum mighty demon with mechanical secondary’s?

To really be sure it's a Mighty you'd have to pull a bowl and metering block off and see if there are replaceable jets in the emulsion holes. The Race Demon had these jets but the Mighty did not....and that's of course assuming the blocks were never swapped out. Mighty Demons also were not set up for replaceable booster nozzles like the Race Demons, again you can tell from the inside. We know it's at least a Mighty Demon because there's no choke horn on the primary side.
The metering blocks and baseplates were billet aluminum but the body and bowls on the older ones were a cast zinc alloy. I have an 850 Speed Demon (from the Barry Grant era)and it's considerably heavier than the aluminum body Quick Fuel that I have. It's too bad the baseplate and linkages are in rough shape on yours because they don't make replacements anymore....you have to use a Holley baseplate and they aren't 100% identical.

 

[All4rocks]

Here’s a pic of inside the metering block.

 

[All4rocks]

So is this a race demon or a mighty demon?

 

[beanhead]

So is this a race demon or a mighty demon?

If the main body has removable boosters like this, it's the Race Demon.

 

[All4rocks]

thanks beanhead. ill go check.

 

[All4rocks]

It looks to have t

If the main body has removable boosters like this, it's the Race Demon.

It looks to have those!

 

[beanhead]

Welp...that be the Race Demon.
Unfortunately, people had a love/hate affair with the Demons then (mostly hate)..Many people refused to use them; yet some (like myself) seemed to get good results. I never got one that was full of shavings, had un-drilled passages, wouldn't take a tune, etc but lots of guys did and as such the BG stuff never really blossomed IMO.
The pisser with the older BG carbs nowadays is getting proper replacement parts. Holley has about zero interest in providing much support for the original demons beyond just the basic rebuild kits/jets/stuff like that.
If you call them looking for parts or info they pretty much just tell you to buy a new one....Lame!