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Old 10-13-2010, 03:00 AM
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Quadrajet>750 DP w/ t56?

Hey guys, quick question. Right now i have a double pumper carb on my 383, its been running as good as i think it could for the last few months. I average 22mpg highway or more depending on how fast i go. Anyway, would it be a wise swap for a quadrajet, if so how would I know which one to look for? Such as CFM and such? I like my DP, but it dosent have a choke, and it gets cold when leaving school at 2am, she never wants to run until a minute or so.

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Old 10-13-2010, 03:14 AM
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Why not fix the choke? Seems it would be cheaper that buying a Q-jet and spreadbore intake.
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Old 10-13-2010, 03:21 AM
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Quote:
Originally Posted by sqzbox
Why not fix the choke? Seems it would be cheaper that buying a Q-jet and spreadbore intake.
Well... thats the problem. I have a proform mainbody w/ adjustable air bleeds and I have everything set up.. id hate to get a different mainbody.
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Old 10-13-2010, 03:27 AM
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OIC. You've traded driveability for performance but you want both.
I hate it when that happens!
The Quad might be the way to go. I'm a holley man myself but others on here will set you in the right direction.
Just have to wait for someone to post on this thread. Shouldn't take too long.
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Old 10-13-2010, 03:36 AM
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Quote:
Originally Posted by sqzbox
OIC. You've traded driveability for performance but you want both.
I hate it when that happens!
The Quad might be the way to go. I'm a holley man myself but others on here will set you in the right direction.
Just have to wait for someone to post on this thread. Shouldn't take too long.

Yeah well thats automotive for you. It was all good when i was in the south, but i just came back to school in the north a couple weeks ago, so now its pretty cold up here at early morning times. Thanks for the info.
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Old 10-13-2010, 04:29 AM
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Id stay holley

I ran a 800 dp holley with no choke on a big *@# poncho engine and had the same cold start problems.

A quadra-jet worked well for me when i used them but they are no longer a cheap option. About every one you find needs a rebuild upgrades and tuning to work well.

There are places such as jet that will build you one from your specs and it will work perfect. However, They are bout as much as a new holley with a choke. It sounds like you have experience and are comfortable tinkering with the holleys. So i would stick with holleys.

Just keep your eyes peeled for a good used 750dp and freshen it up and tune. Or for the best cold drivability, a vac sec so long as your cam duration is under 230 @ 50 thousands. then you wont sacrifice to much performance and you can use your other jet and power valve sizes as a good baseline for tuning.

Holleys have been around a long time and they are all over ebay and craigslist. Its easy to buy a good used one. Just bring a strait edge and check the base for strait and make sure none of the screws or float pins are stripped out. Other than that everything can be cured by a cheap rebuild.

Just my opinion
Hope it helps.
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Old 10-13-2010, 06:36 AM
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I have a custom Quadrajet from Cliff Ruggles. It doesn't have a choke. I can fire my car up and pull away with a stone cold motor and not have any troubles...
http://www.cliffshighperformance.com/

Why not let it warm up for a minute.. I always let my motor warm up...
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Old 10-13-2010, 07:47 AM
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If you have a vacuum gauge you might try adj the A/F ratio for best rich idle
instead of best lean. That would involve finding the highest vacuum reading at best lean and backing out the A/F screws as far as you can before the vacuum reading starts to drop. That will richen up a little on the idle circuit and may help with cold starting and run being you don't have a choke.
I used to have a cammed up Javelin 360 and you couldn't drive it for 5-10 min. till it warmed up. My biggest problem with that was it didn't want to idle either (no choke). Richening up the A/F helped with that without having to raise the idle speed beyond where I wanted it after the engine warmed up.

Worth a try.
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Old 10-13-2010, 11:58 PM
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Im going to do that tonight actually. also im running vaccum advance, but its at about 35 degrees at idle, i havent adjusted it lately. i have 20 degrees of advance at all times, plus the 30 mechanical i have. if i adjust the vacuum advance so it dosent come in at idle, that would technically richen it up at idle only, correct?
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Old 10-14-2010, 08:59 AM
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seems like you are having the "normal" carb issues.

I say, warm it up for a minute then go. simple fix.

if you want to upgrade, spend money on efi, not another carb.
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Old 10-14-2010, 09:38 AM
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Quote:
Originally Posted by pitts64
I have a custom Quadrajet from Cliff Ruggles. It doesn't have a choke. I can fire my car up and pull away with a stone cold motor and not have any troubles...
http://www.cliffshighperformance.com/

Why not let it warm up for a minute.. I always let my motor warm up...
I bought a q-jet for $50.oo from e-bay and talked to Cliff and got all the right stuff to rebuild it for $119.95 . Spent an afternoon going through it and it ran perfect straight off the bench . If you're not comfortable building a Q-jet stick with what you know which seems to be Holley . Personally I LOVE a Q-jet . If you do decide to buy a used Q-jet , there are some numbers that are preferred . I asked a guy on here before I bid on mine . It did have parts missing but Cliff supplies them all .
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