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Old 04-07-2008, 01:51 PM
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Quadrajet adapter plate

I have a 72 Chevy 350 Truck 350 auto with shift kit and an Edelbrock carb and intake. I want to go to a Quadrajet but my intake is for a square bore carb. Can I modify the manifold to accept the Qjet? Are the adapters bad for performance? I am trying to improve gas mileage under normal driving and power when pulling a 5000 lb trailer.

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Old 04-07-2008, 02:00 PM
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I put an adaptor plate on a square bore intake for a q-jet and it runs fine. Has the same power but better mpg. took some tuning to get it right.
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Old 04-07-2008, 02:19 PM
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i did the same, but i had to grind the holy dog crap outta the adapter plate to get the secondaries enuf room to open all the way up. this i think was for a square bore to spread bore or vise versa style adapter plate. i'm sure there has to be better out there. i believe spectre made it
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Old 04-07-2008, 02:48 PM
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Make sure its a 4 hole spacer or your wasting your time.
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Old 04-07-2008, 02:49 PM
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well from my experience the edelbrock gets way better mpg's than a quadra-puke what the heck do you want a quadra-puke for if you tune it right the edelbrock is way better i've had both and i'll say it one more time the edelbrock is way better than the quadra-puke
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Old 04-07-2008, 02:54 PM
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There is no comparison between a well tuned Qjet and an edelbroke. There is a reason GM was able to stay carbed long after the rest had given up and went fuel injection.
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Old 04-07-2008, 02:57 PM
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only because chevy rocks you do know ford circled thier problem
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Old 04-07-2008, 03:51 PM
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Sorry but I'll take a Q-jet over any other carb any day of the week.

I like them so well I'm running four of them.
1 on my very first car. ('57 BelAir 2-door Hardtop)
1 on my 150 Handyman Wagon. ('57 Chevy Wagon)
1 on my '86 LS Monte.
1 on my newest toy. ('57 210 DelRay)

I once tried 3 different Holleys. None ran as good as the Q-jet I removed.

As for finding a spacer to adapt a Q-jet to a square bore intake, try ebay for one. They're out there and you won't have to do any grinding, swearing, throwing tools, or kicking the dog to get the Q-jet to work like it needs to.
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Old 04-07-2008, 04:10 PM
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Quote:
Originally Posted by chevyman420
well from my experience the edelbrock gets way better mpg's than a quadra-puke what the heck do you want a quadra-puke for if you tune it right the edelbrock is way better i've had both and i'll say it one more time the edelbrock is way better than the quadra-puke
LMAO,
And this comparison is based on what? A brand new fresh out of the box 600 Edelbrock compared to the old, leaking, shaft worn, accelerator pump rotted dirty infested and plagued quad that had already proudly carried its weight in gold past 150k without a single problem.
I am a fan of the Edelbrock myself, BUT I am also one of the first to admit they are by far of no comparison to a carburetor that has been around longer then my 39 years and propelled countless more mills beyond the mileage point that an Edelbrock will ever due.
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Old 04-07-2008, 04:15 PM
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Lets not get into a whizzing match on the merits of different carbs. Try to keep it ontrack with the original question.

Yes, there are Lots of adaptors to choose from and they work fine for the intended purpose.
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Old 04-07-2008, 04:17 PM
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Quote:
Originally Posted by chevyman420
well from my experience the edelbrock gets way better mpg's than a quadra-puke what the heck do you want a quadra-puke for if you tune it right the edelbrock is way better i've had both and i'll say it one more time the edelbrock is way better than the quadra-puke
"First, you need to understand that the Quadrajet, unlike the Holley carb, is an "air valve" carburetor that senses air flow requirements of the specific engine and meters fuel to those requirements." Maybe you should lay off the pot and get past your ignorances.
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Old 04-07-2008, 05:38 PM
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Quadrajets will always have my vote as best carb. Many call them junk and many other names simply because they dont know how to work on them and dont understand them. They are a very simple carb to rebuild, and they use the same parts most other carbs do. Once you learn to tune it for a performance application, you wont go to another carb. Take a fresh mild performance build 350, slap a fresh Q-jet on it, the throttle response will be so sensitive you'll swear its fuel injected.
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Old 04-08-2008, 08:52 AM
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Thanks everyone for the help. I didn't mean to start a pissing match but it does confirm my reasons for going to the Qjet. I am also going to be rebuilding my 66 Catalina with a 428 that is currently running a small Edelbrock and switch it to a Qjet. Right now I think I am undercarbed but it runs much better than it did with the 800 Holley.
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