Thread: Picking out a Holley 750cfm Carb

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AFter having taken a break from here..

I'm looking for info on the Holley 750 Double Pumper carburetors. I'm changing from a Rochester Qjet setup.

Specifically the 3310, 4150, 4160, and 4779.

I need to know which one is the best for my set up.

And weather I should add the Holley 112-96 base plate to it

I use a Edelbrock Performer manifuld.

I see a lot of 3310-3's around. Although I can get 3310-2 and 3310-4 pretty easy too. I don't know the specs of the 4779. Then theres the 0-80508 carb.

The engine I have it on right now is a pretty well built 350 with common parts. Normal every day pump gas is what I'm using.

Help picking out which carb I should use would help.

Thanks,
Greg

What would I do?

I'd send the Q-Jet to Cliff Ruggles to be tweaked for my motor. Then I'd bolt in on an Edelbrock Performer RPM Q-JET #7104 intake manifold.
http://www.cliffshighperformance.com/quote.html

In my opinion, there is no better carburetor to meter fuel for an internal combustion engine than the Rochester Quadrajet.

We need more info, CID, cam specs, gear ratio, stall speed and short block info before we can inform.

I'm using a stock 700R4. Ghanged it from a TH350. With a Ford 9" with a 28 spline. I tried to pick out a gear between 2.50 and 3.50. That range seemed to be pretty common in my research. Thinking about changing it to a 28 spline 3.70:1 though.

Manifold is the Edelbrock basic small block chevy 2101/2104.

Motor / block is a GM 3970014. I can give you other codes on the block.. or even the build sheet with the dyno numbers with my setup. I'm using stock GM 1.94 & 2.02 heads.

I've got a Comp Cam's camshaft in there.. 12-246-3 grind #XE274H-10.
I'm thinkin about chaning to the 12-325-4 or one of the others for the SBC.

should look about like this: http://www.compcams.com/Technical/Dy...74H-10_001.asp

Different set up tho.

Greg

Originally Posted by gbowne1

I'm using stock GM 1.94 & 2.02 heads.

Ummmm, probably not.

Sorry mistyped the numbers there. I can give you the actual part number of the heads tho.

Greg

Originally Posted by techinspector1

What would I do?

I'd send the Q-Jet to Cliff Ruggles to be tweaked for my motor. Then I'd bolt in on an Edelbrock Performer RPM Q-JET #7104 intake manifold.
http://www.cliffshighperformance.com/quote.html

In my opinion, there is no better carburetor to meter fuel for an internal combustion engine than the Rochester Quadrajet.

Tech what are some of the many problems that the Q-Jet is so well Known for ? Even them High Dollar ones ?

Ummmm, probably not.
Today 01:55 AM

Your Right it's making more . But how much more do you think ?

Well, also consider that I changed from a 3.08:1 GM 10 bolt.

The heads are: GM 3973487

Greg

A box Stock Edelbrock Performer 750 Carb would do you right .

Which one? one of the Edelbrock 1400 series?

Greg

You can buy them with Manual or Electric Choke . Even Re-man 750's . The cheapest one would be with the Manual Choke set up They are metered more for Performance then the Elec Choke Performers are .

I don''t have a manual choke knob, so it would have to be electric right? Or, would it be ok to add one?

Which Edelbrock #?

Greg

The Electric Choke is nice . But yes you can add a Choke Cable and Run the Manual Choke 750 . It's about $50 Bucks Cheaper #1407 Or you could go with the Re-Man 750 if you are low on Ca$h .

Hmm ok..

well i still have another Qjet I could play with too.

I think its a E4ME.. well it looks like one.

I'm sure it was a rebuilt. A $10 garage sale item.

I just snagged it cause it said QJet. I couldnt find the part number on it for the life of me.

It's got the white connector with the three holes near the fuel / air ports next to the filter inlet and the other black wiring connector on the top of the carb. The only # I can find there is a 64614B.

Greg

Originally Posted by techinspector1

What would I do?

I'd send the Q-Jet to Cliff Ruggles to be tweaked for my motor. Then I'd bolt in on an Edelbrock Performer RPM Q-JET #7104 intake manifold.
http://www.cliffshighperformance.com/quote.html

In my opinion, there is no better carburetor to meter fuel for an internal combustion engine than the Rochester Quadrajet.

AGREED! For a street car that you want performance as well there is no better carburator if its set up properly. If anyone disagrees then I would ask how many Carter/Edelbrock carbs and hlleys were used on street cars out fo the factory? Yes they were used but not nearly as much as QJ's. Small primaries for instant throttle response and efficient...cant beat it IMO. Only thing other I would suggest is that another option for a QJ rebuilt to perfection is SMI (Sean Murphy Induction). SMI has carbs out of stock appearing drags cars in the low 10 second range and drive all day on the street. If your car is set up for a QJ right now dont mess with a good thing...send it off to a pro and be done with it.