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Is anyone running a 650 Mighty Demon on their 340/416 #233886
02/23/09 01:58 PM
02/23/09 01:58 PM
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Posts: 1,142
Tucson, AZ
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cruzin Offline OP
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Tucson, AZ
Is anyone running or have used a 650 Mighty Demon on their stroker 340/416? My motor specs are; 10:1, Air Gap, E-heads, Voodo hyd., 226/234 @.050-.494/.513, 727/2500 stall, 3:91. Street driven E-body.

Mighty Demon #5282010GC.

Last edited by cruzin; 02/23/09 05:31 PM.
Re: Is anyone running a 650 Mighty Demon on their 340/416 [Re: cruzin] #233887
02/23/09 05:09 PM
02/23/09 05:09 PM
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roanoke va
kbcuda Offline
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roanoke va
Demon carb selection is by the cam's duration. If you get the wrong carb for the application, you'll neverget it tuned...

Re: Is anyone running a 650 Mighty Demon on their 340/416 [Re: kbcuda] #233888
02/23/09 05:20 PM
02/23/09 05:20 PM
Joined: Jan 2003
Posts: 4,573
...gently down the stream
LAR_414 Offline
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LAR_414  Offline
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...gently down the stream
I'm running two of those on my 414 cube smallblock!

Re: Is anyone running a 650 Mighty Demon on their 340/416 [Re: cruzin] #233889
02/23/09 09:39 PM
02/23/09 09:39 PM
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Michigan
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crlush Offline
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Michigan
I would go with a 750cfm mighty demon

Re: Is anyone running a 650 Mighty Demon on their 340/416 [Re: crlush] #233890
02/23/09 10:21 PM
02/23/09 10:21 PM
Joined: Oct 2004
Posts: 2,843
Connecticut
FurryStump Offline
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I have a 825 on my 408 stroker. I would not buy another Barry Grant Carb. The quality control is bad, I have had to disassemble it twice to clean metal shavings out of it. At this point I'm happy with how it performs. You just shouldn't have to take a new carb apart to clean it so it will work right. This is not an isolated issue.


best of 11.24 at 119 mph 1.60 60’. 68 340 S Barracuda Fastback F.A.S.T [IMG]http://i67.tinypic.com/2mnnnnt.jpg[/IMG]
Re: Is anyone running a 650 Mighty Demon on their 340/416 [Re: crlush] #233891
02/24/09 01:20 PM
02/24/09 01:20 PM
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Posts: 1,142
Tucson, AZ
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cruzin Offline OP
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Why? Were you previously running a 650 Mighty Demon?

Re: Is anyone running a 650 Mighty Demon on their 340/416 [Re: cruzin] #233892
02/24/09 02:10 PM
02/24/09 02:10 PM
Joined: Jan 2005
Posts: 1,647
IL
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71383beep Offline
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It's not a 340/416 but I am running a 650 MD on my mild 383 and LOVE IT! I bought mine from Don at FBO and only had to tune it once per his instructions. It does not stumble, stall, or anything like that...it just goes. Runs a wee bit on the rich side, but does not burn the eyes and I would rather be rich than lean.

It has no choke so on cold start up you have to feather it for about 30-40 seconds or so...no big deal really i don't like driving it unless she's warmed up anyways.

A lot of percieved carb issues are actually timing related...

Demon has had som QC issues, but Don pulls it apart and inspects it and jets it to you cam and engine size. I went with the 650 for the throttle response it is pretty snappy. I could probably use a 750 for better top end, but this car is mostly street driven.


'73 GK6 Challenger Rallye - 340 4-Speed
Re: Is anyone running a 650 Mighty Demon on their 340/416 [Re: 71383beep] #233893
02/24/09 02:39 PM
02/24/09 02:39 PM
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OH--IO
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360904 Offline
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OH--IO


My 650 MD runs great

Re: Is anyone running a 650 Mighty Demon on their 340/416 [Re: LAR_414] #233894
02/24/09 04:16 PM
02/24/09 04:16 PM
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Lincoln Nebraska
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RapidRobert Offline
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Quote:

I'm running two of those on my 414 cube smallblock!


at the same time


live every 24 hour block of time like it's your last day on earth
Re: Is anyone running a 650 Mighty Demon on their 340/416 [Re: RapidRobert] #233895
02/24/09 05:12 PM
02/24/09 05:12 PM
Joined: Jan 2003
Posts: 4,573
...gently down the stream
LAR_414 Offline
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LAR_414  Offline
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Yup.....I love these things. YOu can tune them 8 ways from sunday!

Re: Is anyone running a 650 Mighty Demon on their 340/416 [Re: LAR_414] #233896
02/24/09 05:23 PM
02/24/09 05:23 PM
Joined: Nov 2006
Posts: 1,086
Baton Rouge, La.
StandOnIt Offline
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A BG 650 is good for a 383, unless you are trying to spin the rpm's up real high.


76' Volare, 5.9 magnum w/Iron heads. New best 10.68 at 123 mph 1/4 mile.
Re: Is anyone running a 650 Mighty Demon on their 340/416 [Re: StandOnIt] #233897
02/24/09 06:05 PM
02/24/09 06:05 PM
Joined: Jan 2005
Posts: 1,647
IL
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71383beep Offline
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I was recomended to go 650 from Don and I'm glad I did. Just a blip and the car has really nice throttle reponse and can annilate the tires if I wanted to. I have heard and read alot of bad stuff about Demons, but honestly I have not had any major problems.

Most problems i have seem are usually timing and too BIG a carb.


'73 GK6 Challenger Rallye - 340 4-Speed
Re: Is anyone running a 650 Mighty Demon on their 340/416 [Re: 71383beep] #233898
02/24/09 07:18 PM
02/24/09 07:18 PM
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NY usa
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540challenger Offline
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Demon underrates there carbs the 650 cfm demon would flow aroun the 720 cfm mark. That being said i have a 750 speed demon on my 408 SB. I love the carb runs great now. However, when i frist tryied to fire the motor with this carb it was bumbing fuel. Long story short i took the carb apart lots of small metal debris in the carb some loose must was flakes still attached to the metering block and etc loose screws holding the floats. I called demon i sent the carb to them they rebuilt there cost and shipped it back. The guy i talked too said that their quality control was not good and they had alot of problems but got them straightened out" don't know if that is true or not" I will use demon again but just be carefull and inspect you carb when you get it. I can see alot of old demons carbs just laying on the shelf they don't move like the holley's OK mayeb this wasn't that short

Re: Is anyone running a 650 Mighty Demon on their 340/416 [Re: 540challenger] #233899
02/24/09 09:57 PM
02/24/09 09:57 PM
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Columbia, CT
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moper Offline
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Columbia, CT
I had enough with Demons and the issues. i run the Street Avenger 870VS on the street 4" stroke engines I do. the 650 Demon is a wet flow rating, so it doesnt flow 720cfm, but 650 with fuel in the bowl, as opposed to the old Holley and Edelbrock dry cfm, where a 650 4150 Holley really will flow about 610cfm with fuel in the bowls. The Avenger Holleys are wet flowed too, and the 4" stroke engines like larger carbs.


Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
Re: Is anyone running a 650 Mighty Demon on their 340/416 [Re: cruzin] #233900
02/25/09 12:11 AM
02/25/09 12:11 AM
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Carstairs, Alberta, Canada
dave571 Offline
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Quote:

Is anyone running or have used a 650 Mighty Demon on their stroker 340/416? My motor specs are; 10:1, Air Gap, E-heads, Voodo hyd., 226/234 @.050-.494/.513, 727/2500 stall, 3:91. Street driven E-body.

Mighty Demon #5282010GC.




Are you having a problem with one? Or is this just a carb you are considering?


For that motor it could be debated whether the 650 mighty or the 750 mighty is the better choice.

A 750 mighty would work fine, and the 650 will too. Difference would probably be a couple of mph on the top end. Nothing you would feel in your pants.

If you do have one(or get one), following the FBO tuning guide is a really good idea.







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