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Author
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Topic: Holley Double Pumper vs. Demon vs. Holley HP
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tomslo
Gearhead Posts: 301
From: Jefferson City, MO
Registered: Aug 2000
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posted 01-03-2001 10:55 AM
   
I am looking to get a new carb soon after I get my engine rebuilt. My question concerns which carburetor will be my best bet for performance in as delivered form, a Holley double pumper, a Demon, or the Holley HP series of Double pumpers. It will most likely be a 750 cfm unit. I know the Demon and HP are improvements upon the standard double pumper. I also know that the Demon takes a different fuel line spacing than a standard Holley. I am leaning pretty heavily toward the HP series. Is this the best bet?The car is a street/strip weekend warrior and nice day funmobile. ------------------
1991 F150, 4X4, lift, 35's, 4.9l
1991 Mustang LX 5.0L, AOD
1970 Cougar, 351C-4v, C6
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Moneymaker
Administrator Posts: 18704
From: Lyons, IL, USA
Registered: May 99
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posted 01-03-2001 11:57 AM
I like the Holley. I have very little experiance of my own with the Demon product so it is hard for me to praise of condem it. I have participated in some dyno testing using both the Demon and the HP Holley series, but it was somewhat inconclusive as we were chasing HP and another problem. Both carbs performed well although the Holley made more power. Again, there were other problems so the reslults were sort of biased towards the Holley. I can tell you that Holleys warrantee and support group is second to none. Their presence at motorsports events is evident everywhere. I can't say that about Demon. Maybe someone else has been able to do back to back conclusive tests with similar carbs. (apples to apples that is)  ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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tomslo
Gearhead Posts: 301
From: Jefferson City, MO
Registered: Aug 2000
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posted 01-03-2001 01:36 PM
Thanks Alex.That is the kind of real world experience that I am looking for. I have seen the mags all test a stock Holley against the Demon, but they always "forget" that Holley has more than just the base models.
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TomP
Gearhead Posts: 4637
From: Delta BC Canada
Registered: Dec 99
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posted 01-03-2001 05:06 PM
around here the Demon is about the same price as the Holley... but a friend that works at a speed shop installing them doesn't care much for the demons 
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Rory McNeil
Gearhead Posts: 1098
From: Surrey, B.C. Canada
Registered: Nov 2000
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posted 01-04-2001 04:06 AM
Don`t fall for a lot of advertising hype or glitzy colour ads in the car magazines! On my vehicles, I`ve never had one carb perform "Magic" over another similar carb. Case in point: I have 2 different Ford Fairmonts I bracket race. Car #1;daily driver 302 with stock 351W heads,mild hyd. cam,11/2" headers, Edel. Performer int,T5 5speed, 3.55 gears. I have tried : 600 dp,650dp,750vac,600vac & the carb I have kept on most of the last 6 years is a 550 vac. Holley that came off a 76 F250 PU.I rebuilt it,played with sec springs,jets,&generally just played with it.None of those other carbs made any noticable improvment.By the way this car has gone 12.80@105 in the 1/4 mile with slicks.Car#2 310lb. 428 4speed Jerico,4.88 gears.030 428,stock CJ heads,fairly large solid cam,Ford Sidewinder intake.On this car I have tried:1050 Dom.,950 3 barrel,950 HPseries, 850 dp,800dp,& the carb that has been on for most of the 12 years I`ve been running this car? A 780 vac. sec.that I`ve had since 77.Again, I spend some time seeing what tuning changes accomplished,& none of these "Whiz bang" carbs worked any better than my sorted out 780.I beleive Alex must run the 4100 Autolite 480cfm,countless GM cars have to run Q-jets,Mopars with Thermo-quads.... Spend some time working with a carb, & you can save a lot of $$$$$$ on trick ****.
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Rory McNeil
Gearhead Posts: 1098
From: Surrey, B.C. Canada
Registered: Nov 2000
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posted 01-04-2001 04:18 AM
Man, I need to do a better job proof reading!The 428 car weighs 3100 lbs, not 310!(I`m almost that heavy myself!!!!!)This car has gone a best of [email protected] with the 780 vac.With the other carbs I listed, the next best was [email protected] the 950 HP series.A touch more mph, but not enough to warrent spending $650. US on.If you don`t have a carb, I suppose the HP series would work well,or the standard Double Pumper.The original 4150 design has been around since 1957 (312 Ford)& I think Holley knows Holleys as well as any body else!
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jkilroy
Gearhead Posts: 1636
From: Vicksburg, MS
Registered: Dec 99
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posted 01-04-2001 10:39 AM
I think all of those carbs are good parts and can be made to perform, but if you have ever had to "deal" with the Barry Grant folks, they are a bunch of A**HOLES. Granted, its been a while since my 'experience' but still, I don't forget stuff like that. ------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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Moneymaker
Administrator Posts: 18704
From: Lyons, IL, USA
Registered: May 99
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posted 01-04-2001 12:22 PM
I think that I can vouch for Rory's assessment that given the time for tweaking, you can make most carbs work favorably with your particular combination. (EXCEPT A-llmost F-our B-arrels  ) LOL ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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tomslo
Gearhead Posts: 301
From: Jefferson City, MO
Registered: Aug 2000
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posted 01-05-2001 04:37 PM
Thanks for the help guys! This is the place to go for real answers! I have decided to go with the Holley 750HP. It has some features already built in that I would like, so all I would really have to worry about is Jet swapping.
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