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Old 08-26-2006, 09:30 AM   #1
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Carburetor size for 347

I understand there are many factors that go into choosing a carb. I will try to be as complete as possible with my new combination. I will be using it 95% 1/8 mile drag strip and 5% street.
The Combo in my sig is in the process of being built. I was using a Bigs stage 5 650 DP/HP on my 375 hp 306. I just don't feel like this is going to get the job done on my new 347.

347 Girdled stock block, half poured. Forged internals. Canfield heads heavily ported ,2.02/1.60 valves. Ported victor jr. intake .1 7/8 Kooks headers. Holman Moody Cam 298/304 .568/.568 lift soild flat tappet ,Redline approx. 7800. 11-1 compression (actual) Electric water pump. somewhere around 485-500 hp.

4.56 gears , G force T-5. 10pt cage 28x10.5 Et streets.

Any suggestions would be greatly appriciated. Carb Experts help me out!!!

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Old 08-26-2006, 09:45 AM   #2
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www.theengineshop.com

call their tech line, best carb for cheaper then a barry grant or demon.

I think you will need at least a 850 cfm double pumper.
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Old 08-26-2006, 09:48 AM   #3
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i have ran carb set ups for about 4 years now. i have found that bigger is sometimes really 2 much.a modified 650 would do more than you think on a 347 combo like yours.i have a friend on here selling a brand new 750 demon carb cause he changed from a 650 thinking he was going to gain.he runs consistent 6.80s to 6.90s on motor with the 650 demon.he also has a 347 set up that is a track car only.i would try the 650 first and go from there.but if your gonna run some nos or something then you might then start with a modded 700 DP or something.i hope this helps,everyone wont agree but hope it helps.
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Old 08-26-2006, 09:49 AM   #4
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Im running a Quick Fuel 750 on my 347, though its a bit small, at WOT I have 1.5" of vacuum.
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Old 08-26-2006, 09:51 AM   #5
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whats the actual flow on that carb you have?

you probably need something over 800 cfm but with a 750 cfm venturi size.down leg booster on this size venturi probably best.
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Old 08-26-2006, 09:53 AM   #6
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Jesse at Bigs says that the 650 stage 5 flows somewhere around 680-690.
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Old 08-26-2006, 10:15 AM   #7
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yeah i knew it flowed better than just 650 cfm. because it is moddified i would really try it first.honestly because you are going bigger with the motor dont mean the carb has to be a real big one.
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Old 08-26-2006, 10:23 AM   #8
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there is only one phone call you should make. You'll probably hear this a lot...

PROSYSTEMS

PERIOD!
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Old 08-26-2006, 12:33 PM   #9
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Quote:
Originally Posted by byebye2u
i have ran carb set ups for about 4 years now. i have found that bigger is sometimes really 2 much.a modified 650 would do more than you think on a 347 combo like yours.i have a friend on here selling a brand new 750 demon carb cause he changed from a 650 thinking he was going to gain.he runs consistent 6.80s to 6.90s on motor with the 650 demon.he also has a 347 set up that is a track car only.i would try the 650 first and go from there.but if your gonna run some nos or something then you might then start with a modded 700 DP or something.i hope this helps,everyone wont agree but hope it helps.

a 650 is way too small for his setup. Even modified.
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Old 08-26-2006, 01:19 PM   #10
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Also, keep in mind I'll be tuning for max on top end. At the track this motor won't see below 5000.
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Old 08-26-2006, 01:24 PM   #11
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I run a quick fuel 750 on my 393.. I would think a 750 would be right up your alley also..
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Old 08-26-2006, 01:25 PM   #12
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+1 to that.

I run a modified bill mitchell 750 DP that flows 990 cfm on my 393
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Old 08-26-2006, 11:08 PM   #13
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What do you guys think about a 750 Dominator. I know where I can get a good deal on one.
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Old 08-27-2006, 02:42 PM   #14
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I would go with an 850cfm myself.
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Old 08-27-2006, 06:10 PM   #15
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a 390 cfm holley is capable of over 700 hp with 358 cubic inches............
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Old 08-27-2006, 06:30 PM   #16
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NASCAR runs a 390 in the trucks and busch cars.

I would not reccomend an Edelbrock carb though. They are junk!!!!
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Old 08-27-2006, 10:36 PM   #17
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Yeah, I went down that road with the Edelbrock on one of my old engines. JUNK. I used to work on a Craftsman truck/ARCA team in the 90's and early 2000's. It's amazing what you can get out of those small carbs. What's even more amazing is what you can get out of the same engine with an 830. We did that on several occasions. We had a limited engine supply. But you'd better be careful about jetting, we burned more than one piston.
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Old 08-28-2006, 05:02 PM   #18
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Everyone thinks bigger is better. Well on this one, theyre wrong!!

Personally I would go with a 390cfm carb...
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Old 08-28-2006, 06:52 PM   #19
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Then why do you have a huge 650 on your 351?
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Old 08-28-2006, 06:53 PM   #20
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He has a High-RPM, drag car which will see idle and WOT, thats about it. At WOT, you want zero vacuum. Somehow I dont think a 390 will get him there.....
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Old 08-29-2006, 04:10 PM   #21
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Quote:
Originally Posted by BadAss88GT
Then why do you have a huge 650 on your 351?

dude... a 650 aint "huge" it is a decent carb on any car.. I just dont have a friggin 9.0 - 11.0 sec car.... or waht ever he has... it sure beats the 850DP that was on it when i bought it..... that was just my opinion... i didn't say he had to use it... did i? im pretty sure i didn't ....


thaks for the quesiton... though....


Jon
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Old 08-29-2006, 04:12 PM   #22
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Quote:
Originally Posted by BadAss88GT
He has a High-RPM, drag car which will see idle and WOT, thats about it. At WOT, you want zero vacuum. Somehow I dont think a 390 will get him there.....
Well, you take a motor, tranny, rear end, etc. out of a nascar, then put the 390 on it.. I'd say it would do jsut fine in a high rpm drag car.....
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Old 08-29-2006, 05:02 PM   #23
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The boy just dont get it....
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Old 08-31-2006, 07:22 PM   #24
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What don't you get?
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Old 08-31-2006, 09:45 PM   #25
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i have a 358" sb2 that makes over 700 hp with a 390 holley on it for sale if someone is interested in turning a N/A engine 9200. lol
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Old 08-31-2006, 10:02 PM   #26
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if it was a street car the 650 would work fine. because it is a high rpm drag car i think you need a 830 or more, but i'm no expert. the carb shop can build a carb to fit your combo and your needs. they build carbs for more top drivers than anyone.
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Old 08-31-2006, 10:06 PM   #27
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since your not going to see less than 5000 at the track Id use a 850 and tune with spacers..

if your going to drive the car go with a 750


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Old 08-31-2006, 10:32 PM   #28
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Fwiw...evidently you don't want to take my advice and call prosystems. (www.pro-system.com).

Which is fine. then my recommendation would be a 750 or even 850. I agree that bigger isn't always better, but my 302 made the most power ever with a 750 on it.

I was just on the phone with one of the smartest engine builders around. He had WON the engine masters challenge. We talked about my 347, and he suggested a 750 MINIMUM...or even an 850.

This guy has more time playing with a dyno, than the average person on the corral has been alive!

Take a good word. 750 holley HP series...you'll be glad you did.
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Old 09-01-2006, 05:33 PM   #29
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I don't know BADASS seems to know everything about this carb. stuff.. you know he is the "BADASS" even his name says it..
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Old 09-01-2006, 07:10 PM   #30
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Guys, Thanks for all your input. I called Jesse at Bigs Performance and he is building me a Stage 7 750 DP for my combo. He says it will flow about 830-840. I figured, they hooked me up with the 650 on my last combo, so why not go with the quality I already knew. There are many aspects that go into chosing a carb. What I have found is that there are as many different opinions as there are different builders. I say find something that works for YOU and stick with it. I'll post some numbers as soon as I get to the track.
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Old 09-01-2006, 07:38 PM   #31
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they have 7 stages of carbs?

damn....
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Old 09-01-2006, 09:54 PM   #32
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The thing I believe you're failing to remember about the 390 carb is , the engine that it is run on is built to maximize the small airflow. I promise you there is not a Cup, Busch, Craftsman truck, ARCA or any other NASCAR competitor making 700 horsepower with a 390.Maybe 550 or so. All those guys run 830's on most tracks. When they are required to run small carbs it's to serve the same purpose as a restrictor plate. To REDUCDE HP. I used to work on these cars and have seen it first hand. Not trying to cause any friction, just trying to set the record straight.
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Old 09-02-2006, 01:01 AM   #33
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Exactly my point. But dont take my word, I only recommend the same carb as all the custom carb guys will, you might be better off listeneing to the 16 year old ASSCAR fan from Indiana, after all, his car goes what, 13s, which is almost the same as what the thread starter's car will run...well, 13s, 10s, close enough....

A 7800 RPM 1/8 mile drag car and a Winston Cup car are not even in the same league, they have no business being in the same discussion. If youre gonna debate, use a fair comparison.
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Old 09-08-2006, 10:55 AM   #34
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Quote:
Originally Posted by BadAss88GT
Exactly my point. But dont take my word, I only recommend the same carb as all the custom carb guys will, you might be better off listeneing to the 16 year old ASSCAR fan from Indiana, after all, his car goes what, 13s, which is almost the same as what the thread starter's car will run...well, 13s, 10s, close enough....

A 7800 RPM 1/8 mile drag car and a Winston Cup car are not even in the same league, they have no business being in the same discussion. If youre gonna debate, use a fair comparison.

what, are you jealous that you did not have as fast of a car a 16????

13's is for right now, unitl this winter when I completely rebuild my motor~~~


just wait,,,
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Old 09-08-2006, 11:48 AM   #35
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I run a Bigs stage 5 750 on my 347 and a Bigs stage 5 950 on the 408
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