Demon vs. Holley Carbs

[dspaulding70]

Anyone have thoughts on which way to go? 

I have a rebuilt 440 that needs a carb and I am struggling on which way to go.  I have ordered a Holley 770 but the shop guys are suggesting I consider a Demon carb.  I can easily return the Holley so that is not a consideration.  Please give your opinion.

[70 Charger RT]

I'm not familiar with the Demon but I was happy with the Holley 770.  It was fairly easy to adjust and to replace jets if you ever wanted to.

[moparstuart]

demon's are great , and usually run great but if you do ever have a problem there customer service is the worst .

[CHRGR SE]

The shop doing my car prefers modified Edelbrock (AFB) carbs. The cars they build start right up without touching the pedal.

[moparstuart]

The shop doing my car prefers modified Edelbrock (AFB) carbs. The cars they build start right up without touching the pedal.

carters were good enought for the hemi   

[kamkuda]

I have had a Edlebrock, Demon and Holley DP on my 408 stroker and on my 440.  There were are 750 cfm.  I still have all 3.  The Holley is on the engine.  It provided easy tuning and the best power.  The Edelbrock is a decent, easy to tune, carb (just different) that has good street manner if you have good idle vacuum.  The Demon works but it generally fat at idle and leaner up top. Some of the newer models have quality issues.  I currently have the Holley on the car.  Tuned better for good air fuel at idle and throughout the power band.  It was the best of the 3.  But all carbs worked  I would keep what you have.

[ronv]

I've been using Demons for the last 4 years. They all have been great out of the box and with a few air bleed chagengs I have gained 15 hp on the chalssis dyno. I have had no reason to even consider changing brands. 

[Challenger340]

Best fuel curves and power, we've seen on the Engine Dyno, were Holleys.
Downleg booster 4150 HP series 

No "diss" on the Demons, if you've got one and are happy, thats GREAT !

Anybody else, seen goofy fuel curves on the BG's on the Dyno ?
Seems to be BG metering problem ?

[Runner]

Best fuel curves and power, we've seen on the Engine Dyno, were Holleys.
Downleg booster 4150 HP series 

No "diss" on the Demons, if you've got one and are happy, thats GREAT !

Anybody else, seen goofy fuel curves on the BG's on the Dyno ?
Seems to be BG metering problem ?

    when the bg claw carbs fist came out a buddy of mine bought one.  we bolted it on and turned on the fuel pump and the carb looked like a rain bird sprinkler spraying fuel out of both fuel level adjusters.  they didint put anly gaskets on either one.  the real joy is when you call them they are rude to ya.   other than that the carb has worked well,  all though it was a 850 and replaced a 750 dp holley and never et'ed any better on a decent running 454 street motor.

[firefighter3931]

No real "dyno" experience with a Demon but i've tried to dial in a few with no luck. Holley or Proform for me 



Ron

[Rolling_Thunder]

Screw Demon Carbs!    I have run 5 of them and NONE of them ever ran correctly...    idle issues, return to idle issues, power issues....          Buy a Holley!  I like edelbrocks myself but holley > Demon

[oldschool]

Screw Demon Carbs!    I have run 5 of them and NONE of them ever ran correctly...    idle issues, return to idle issues, power issues....          Buy a Holley!  I like edelbrocks myself but holley > Demon
[/q
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]

i like holley's,very,very,very easy to tune.
i have them on all of my cars!

[Ghoste]

Ironically, Barry Grants business took off largely as a result of poor quality from Holley and a lack on Holleys part to respond to customer needs.

[mally69]

Ironically, Barry Grants business took off largely as a result of poor quality from Holley and a lack on Holleys part to respond to customer needs.

So, demon's should be better, correct. That is if demon were made becuase of holley's poor quality?

[kamkuda]

Ironically, Barry Grants business took off largely as a result of poor quality from Holley and a lack on Holleys part to respond to customer needs.

So, demon's should be better, correct. That is if demon were made becuase of holley's poor quality?

I have heard that the demon had the most quality issues and part of the reason that Summit no longer supports that brand.

[Ghoste]

A couple of things happened since Barry Grant became popular.  First of all, he went from a small time Holley modifier to a big time mfg in his own right.  Secondly, Holley sued him for the first line of BG carbs which led to the Demon series and some retooling and engineering to make sure they were a little less Holley.  These two factors ensured he was unable to give the kind of personal attention to quality that he started with.

[G-man]

I myself heard of Chrycho Psycho "exorcising" 5 or so Demons into the garbage bin. Stuck Holley and had NO problem.

What I also had heard was the demons support tech is a joke, they run you through a 100 questiosn liek you dont know what your doing "did u check this, did u check that, did u make sure its bolted on right etc etc" and just running u through a list of 100 things instead of admitting there carb is no good and just to give u a refund.

Also there were metal shavings found in many of them (this may have by now been fixed)

Also, because they are so "specific" it is very hard to tune and when tuned stays tuned for not very long (1 day out). Where as holley stick on and forget about it.

Holley has been around for a lot longer. Holley carb engines win championships. Holley Carbs cost less and provide better/hassle free quality.

If you go with PROFORM or BIGGS or something rather... you end up with a tweaked holley. Now you cant beat that!

Go Holley and forget those demons, they only cause trouble (read ur bible if u dont believe me) 

[ronv]

Some anti-demonites here! dspaulding70, what did you go with? How is it working?

[Challenger340]

Some anti-demonites here! dspaulding70, what did you go with? How is it working?

I ain't an "anti-Demonite"

I just can't get the fuel curve "happy" on the Dyno, and my EGT's are poor with them.
Lotsa guys run them, and Love them !

Just shows how Crappy a Mechanic I am !

I'll keep trying, one day I'll figure it out.

[83CHARGER2.2]

Ihave had a few Demon's and had no issues. I would also add that I removed and inspected the floats bowls and metering blocks and made sure there was no chips and debris. Many people have had issues as a result of machining debris. I can say that my Demons performed well with no extra tunning. I had a proform that I needed to mess with the idle air bleeds to work correctly but eventualy worked OK. Demons seem to be priced beter than Holleys but I havn't checked recently.

[Chryco Psycho]

carters were good enought for the hemi   

& gave up a couple hundred HP to keep the power reasonable for Joe Public