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Old 02-18-2007, 03:03 PM
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Chevy 383 Carb?? Which 1 to run??

I am looking for a carb for my Chevy 383. I plan on running nos somewhere in the future. I currently have a Holley 670 vac secondary Street Advenger carb that a friend bought and never used. I was think this was a little small for my app.

Eagle Forged Rotating
SRP flat pistons
Dart Iron 215cc heads with 72 chambers
9.7 compression
Comp Hyd roller cam 288hr 236/242 @ 050 520/540 lift

My trany is a T56 6 speed and i have 4.10 gears.
Goin in an 84 Camaro z28 weighin 3400lbs.
The car will be a summer driver seing some strip.
I want a Holley carb. Would a 750 DP be about the right size??
What would gas mileage be with a 750 DP??
Would a vac or mech secondary carb be better for my application??
Any suggestions plz??

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Old 02-18-2007, 04:24 PM
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that 670 carb should work perfect for your application if you plan to keep it under 6500 rpm, which being a stroker I would advise, vac secondaries is what you want for a mainly street driven car

Good luck

Last edited by kuhn-77; 02-18-2007 at 06:50 PM.
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Old 02-18-2007, 05:02 PM
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"I want a Holley carb. Would a 750 DP be about the right size??"

Yes, for drag racing where you are looking for maximum performance.

"What would gas mileage be with a 750 DP??"

Awful.

"Would a vac or mech secondary carb be better for my application??"

Vacuum secondaries 670 for the street. Double pumper 750 for the strip.

"Any suggestions plz??"

Use both carbs and change them out per the application. The 670 won't make max power and the 750 won't give you any mileage. It doesn't take that long to change carbs.
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Old 02-18-2007, 10:31 PM
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I just have had no experience with a mechanical carb or a carb bigger then 650 on a street car.

I had no idea how bad it would be on gas. I see alot of ppl runing then on street strip cars so i didnt think they would be that bad.
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Old 02-18-2007, 10:41 PM
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A 750 double pumper can be tuned to deliver the same fuel mileage as a 650 or 670 vacume secondary- at cruize rpm/part throttle. It involves tuning the idle circuit, power valve circuit and main jets. Basically you need to jet down and open up the power valve circuit to make up for it during WOT. Double pumpers flow more fuel through the main jet and less through the enrichment circuit than a vacume secondary carb.

I'd definately run the double pumper with the 6 speed-wouldn't think twice about it.
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Old 02-18-2007, 10:52 PM
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I'd have to run the 670 if I was more street than strip.
If you fell like passing everything but the gas station, go for the 750. Like Bob said, you can get away with it by running a 6-speed. Might want to jet it a bit on the lean side, and adjust the rear butterflys wisely!
My .02....
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Old 02-18-2007, 11:09 PM
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Quote:
Originally Posted by baddbob
A 750 double pumper can be tuned to deliver the same fuel mileage as a 650 or 670 vacume secondary- at cruize rpm/part throttle. It involves tuning the idle circuit, power valve circuit and main jets. Basically you need to jet down and open up the power valve circuit to make up for it during WOT. Double pumpers flow more fuel through the main jet and less through the enrichment circuit than a vacume secondary carb.

I'd definately run the double pumper with the 6 speed-wouldn't think twice about it.
The reason I said what I did about awful gas mileage is because unless you have more control over yourself than I, you'll be into the secondaries all the time. It just sounds and feels so goooooooood.
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Old 02-19-2007, 12:47 PM
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Quote:
Originally Posted by techinspector1
The reason I said what I did about awful gas mileage is because unless you have more control over yourself than I, you'll be into the secondaries all the time. It just sounds and feels so goooooooood.
Yah lol This engine is goin into my 84 Camaro Z28 and i dont think i will be able to help myself from punchin the pedal. This is my first engine and car build. I will drive my jeep as an everyday driver and only drive this thing for night cruizes or on weekends.
I think ill run the 670 at first and buy a 750 DP for the strip.

Also 1 other question is what size Harmonic dampner should i get?? The 6 or 8" ?? Also should i just get a steel pioneer 1 for $100 or spend the 200-300 for a fluid filled??
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Old 02-19-2007, 02:52 PM
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You'll have to use a SFI 18.1 damper if you plan to go 10.99 or quicker at the dragstrip. If that isn't your plan, then I would go to these guys to get the correct damper.
http://www.damperdoctor.com/
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Old 02-19-2007, 07:17 PM
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I think Id use a 750 DP with that combo
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