Holley or Mighty Demon, thoughts please
Thread Starter
Heel & Toe
Joined: Nov 2005
Posts: 22
Likes: 0
From: Eagle Grove IA
Holley or Mighty Demon, thoughts please
I am currently running a Holley 750 dp mech 2nds. I have read alot of articles on the Mighty Demon with annular booster, Demon claims their carb handles lower rpm range, when running large cam, aftermarket heads, intake, etc. Anyone make the switch and if so, did you like the results?
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Yup switched from a 750DP to a 825 Race Demon, I love the Race Demon, the Holley was a good carb too 
Last edited by MotorHead; Nov 27, 2005 at 12:10 AM.
Le Mans Master
Joined: Apr 2000
Posts: 7,562
Likes: 9
From: B'Ville NY
Cruise-In III Veteran
St. Jude Donor '05
I have a 750 Mighty Demon that I've been very impressed with. It has many items that just seem to be improved upon over the Holley like the nice 4 corner idle adjustment screws that don't feel loose, the clear float level windows with level lines cast into the fuel bowls, etc. etc.
Le Mans Master
Joined: May 2003
Posts: 8,877
Likes: 3,556
From: Fernandina Beach FL
2023 Restomod of the Year finalist
2020 C3 of the Year Winner - Modified
Holley 600 to 575 Speed Demon
I had the Holley on Brodix Headed 327 and just couldn't get it to idle right w/o running to rich. Put on the Speed Demon-WOW-what a difference w/ the idle-ez. Not to mention gas mileage went up considerable and motor really smoothed out. Very happy w/ the BG carb.
Racer
Joined: Oct 2005
Posts: 267
Likes: 0
From: Orlando FL
I called a speed shop near my house today and they said that BG Demons are prone to fuel leaks. I am also interested in making the switch to a Demon carb but am concerned if this is true. Anybody know? Also, what is the difference between a Race Demon and a Speed Demon or Mighty Demon? Jegs told me that the Race Demon is a racing carb. What exactly does that mean, besides not having a choke tower? Is it not recommended for a street driven car and why? The Holley I have on there now seems to hesitate right off of idle and always has. I was interested in going to an annular booster Demon to help the situation. Any information will be appreciated.
Melting Slicks
Joined: Dec 2004
Posts: 2,161
Likes: 0
From: pr, frederick md.
on a different note. im using 850 dp speed demon carb and i have to say im not impressed. the float bowls where almost falling off the carb when i got it, and the secondary arm was in such a bind that i had to force the secondaries to open. my idle-eaze does nothing, and after messing with this thing for over a year, it still has off idle issues. my edelbrock carb ran like fuel injection. go figure. 
Safety Car
Joined: Jul 2002
Posts: 3,770
Likes: 3
From: St Louis MO
Holley....but I might be a little biased....
I had a local guy install some annular boosters I bought off the net...
It's runs like a totally different carb now. It's got more punch down low and is still strong up top.
Brett
I had a local guy install some annular boosters I bought off the net...
It's runs like a totally different carb now. It's got more punch down low and is still strong up top.
Brett
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