Demon Carb?
Team Owner
Joined: Jun 2001
Posts: 43,136
Likes: 155
From: Thomson Georgia
Re: Demon Carb? (mpro72vette)
I am pretty sure that it will........I have a drop base on mine that I ran on the Holley and it fits the demon just fine...I did however have to run a 1/2 inch phenolic spacer in order to clear the rear vacum ports
Team Owner
Joined: Jun 2001
Posts: 43,136
Likes: 155
From: Thomson Georgia
Re: Demon Carb? (mpro72vette)
[QUOTE]Thanks Alwyn678!! How do you like the Demon comparied to the holley?
I LOVE THE DEMON.............................Perfor mance from the 650 demon is much better than the Holley in almost every aspect except starting..By the way my drop base is not stock it is from summit.probably similar though
I LOVE THE DEMON.............................Perfor mance from the 650 demon is much better than the Holley in almost every aspect except starting..By the way my drop base is not stock it is from summit.probably similar though
Melting Slicks
Joined: Jun 2001
Posts: 3,281
Likes: 6
From: NC USA
Re: Demon Carb? (mpro72vette)
Yes. I'm running the L88 drop base which is the same base as the LT-1 on my Demon 850dp. Not sure about the 650 you're looking at, but I had to dimple the inside of the vent tube on the pass side to clear the carb's linkage. If you use a spacer, you probably wouldn't have to but I wanted to avoid any possibility of hood clearance issues with the wingnut since I already have a spider crack on the hood from the previous owner! :mad
BTW, previous owner told me after tinkering with the Holley and then getting the Demon, he'd never run a Holley again.
[Modified by Marks69BB, 11:40 AM 12/13/2002]
BTW, previous owner told me after tinkering with the Holley and then getting the Demon, he'd never run a Holley again.
[Modified by Marks69BB, 11:40 AM 12/13/2002]
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Demon Carb? (mpro72vette)
If I had it to do over again I would try the 750 Vac Sec Speed Demon. I presently use the chokeless versions of the 750 speed D. and the 825 Race Demon.
The 750 fit under my stock 79 hood on top of a Weiand Excelerator single plane with a drop base 3 X 14 open element K&N filter. It barely touched the hood insulation on the top front of the chrome air cleaner
The 750 fit under my stock 79 hood on top of a Weiand Excelerator single plane with a drop base 3 X 14 open element K&N filter. It barely touched the hood insulation on the top front of the chrome air cleaner
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Melting Slicks
Joined: Nov 2001
Posts: 2,659
Likes: 7
From: Katy (Houston) TX
CI 7-8 Veteran
Re: Demon Carb? (mpro72vette)
Marks69BB - I have that same darned spider crack in the hood from the previous owner. I really hate looking at it :mad . I just took my hood off last night to start the engine swap and I'm so tempted to see if they can match the paint and repaint the hood. Maybe if I can sell my old engine for enough I could use that for repaint.
mpro72vette - I think we are going to have the exact same setup. I've got a Speed Demon 750 vac secondary and I believe we ordered the same engine from AR. Would be interesting if they are the same setup to see how they dyno/time in 1/4.
mpro72vette - I think we are going to have the exact same setup. I've got a Speed Demon 750 vac secondary and I believe we ordered the same engine from AR. Would be interesting if they are the same setup to see how they dyno/time in 1/4.
Team Owner
Joined: Sep 2001
Posts: 30,958
Likes: 0
From: Middletown Connecticut
Cruise-In IV Veteran
Re: Demon Carb? (gkull)
best choice i ever made!!! i went from a holley 600 to a Road Demon 625. i noticed about 30 rwhp difference, it really woke up after i did that.
since my carb has an electric choke, i had to modify my air cleaner base to allow clearance..
since my carb has an electric choke, i had to modify my air cleaner base to allow clearance..
Thread Starter
Pro
Joined: Jul 2002
Posts: 589
Likes: 8
From: Palm Bay FL
Re: Demon Carb? (tshort)
Marks69BB - I have that same darned spider crack in the hood from the previous owner. I really hate looking at it :mad . I just took my hood off last night to start the engine swap and I'm so tempted to see if they can match the paint and repaint the hood. Maybe if I can sell my old engine for enough I could use that for repaint.
mpro72vette - I think we are going to have the exact same setup. I've got a Speed Demon 750 vac secondary and I believe we ordered the same engine from AR. Would be interesting if they are the same setup to see how they dyno/time in 1/4.
mpro72vette - I think we are going to have the exact same setup. I've got a Speed Demon 750 vac secondary and I believe we ordered the same engine from AR. Would be interesting if they are the same setup to see how they dyno/time in 1/4.
Tech Contributor
Joined: Aug 1999
Posts: 14,382
Likes: 6,401
From: At my Bar drinking and wrenching in Lafayette Colorado
Re: Demon Carb? (mpro72vette)
We're running BG 750 Speed Demon DPs on all the 427 C2 cars in the CCC (Colorado Corvette Crazies - the ultimate corvette tuning and beer drinking fraternity). We have measured 15hp improvements over properly set up Holleys when we switch to the BG Speed Demons. The height on the BG is the same as the Holley, so it's a direct swap with the air cleaner. We have a bunch of numbers-matching Holleys sitting in boxes here now.... I doubt they'll ever be used again.
