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Post Info TOPIC: Looking for intake and carb upgrades for '68 396 2+2


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Looking for intake and carb upgrades for '68 396 2+2


Hi there,

There seems to be alot of recommendations out there, but no real-life experience I've found. My '68 2+2 has the 396, 325 hp engine with the original Q-Jet 4 barrel and I've lots of problems with it. I thought about upgrading to an Edelbrock intake and Holly carb.

Anybody out there have other recommendations with performance and cost in mind ?

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A Poncho Legend!

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What kind of problems are you having with the factory setup? Perhaps it's strictly a carb issue? I know you can get matched intake/carb combos from Edelbrock for small blocks. I would assume you can get the same for the big blocks as well. Keep in mind you may have to play with the linkage for another carb to work.
Todd


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Poncho Master!

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69Laurentian wrote:

 Perhaps it's strictly a carb issue?



I have to agree with the carb issue. I've run the carbs from Holley and Edelbrock and they are not just a "bolt on and go". I've spent hours and hours tuning.
 I am no expert on rebulding a Q-Jet but when they are clean and everything is tight I have had no problem with them. 
 If you need a good core I think I have one left. I can't remember what the date code is but it is the correct carb for your car, 7029210. I took it off a low mile 68 396 Impala a couple of years a go and it worked fine.
 I send my Q-Jets to a company in Toronto now to have them rebuilt and set up. Let me know if you need their info.
 Good luck
   



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Guru

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Thanks for the feedback guys. I have found a guy here in Sarnia that is willing to rebuild my Q-Jet when I get it out of storage. He was the guy that rebuilt it a number of years ago and thinks my adjustment problems have to do with too much fuel pump pressure. The fuel pump typically pushes arond 10 PSI and the carb can only really deal with 6 or 7 PSI. I have picked up a Summit fuel pressure regulator that we'll add to the system and see how it works in the spring. Again, thanks for the feedback.

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Member

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I agree. Rebuild the Q-Jet you have on the car. Once it is set right, you can forget it for many years to come, aside from minor adjustments.

The Q-Jet is the most mis-understood carb in the business. They are great carbs, not difficult to overhaul, and are utterly reliable.

To change to a Holley or Edelbrock (which is essentially an old Carter AFB) will buy you much grief trying to get everything set up right. Never mind the expense.

Mike

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Poncho Master!

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I totally agree. Once dialed in, the quadra-jet is awesome. Great throttle response, and easily fine tuned.
I would look at an intake swap disguised to look stock, however. Something like an Edelbrock
Performer.


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Uber Guru

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ditto here for the Q-jet. also nothing like that sound when the 2 back barrels open up. wooahhhhhh.....

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A Poncho Legend!

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I like a quadie as well   used to have one that wailed!... recently I have used several new Edelbrocks, and they have been bolt on and go! A 750 is on my Sunbird 355, from Larry Kilpatrick, and it hauls _ss..   Chief has race prepped Holley 650 double pumper, and its perfect... It has a neat effect biggrin, as you open it up, it very carefully leans your head over the seat backrest...

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Canadian Poncho Superstar!

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I have to agree, the quadrajet is a great carb once set up right. I've got them on all my cars. You just need patience to get them set up. But if I was going to go aftermarket I'd choose the Edelbrock carb over the Holley.

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Guru

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Love the Quad, again most mis-understood carb.
Most paople just replace them them with Holleys.
There are more people today that understand and can rebuild them right.
Some models were bad for well leaking and needed to have that epoxied.
But it sounds like you've already found your issue with the pressure.
I don't think any carb would run right at 10 PSI.
They are move forgiving to the too much carb for motor situation as well.


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66 Grande Parisienne, 2dr HT, 327 4bbl, Auto.

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Both still require a lot of work.
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