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Anyone running a Quick fuel carb on a 440?

Moms68

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Considering a 750 Quick Fuel for the 440 I’ve putting together. The engine has zero deck height, 440 source heads, a mild cam and will have headers.

This will be in a street car ‘68 Charger, and projected HP around 500. Looking at an performer rpm intake.

I have a Quick Fuel 650 on a 340 and have had good performance with it.
 
That’s a small carb for a 440. You’d be fine with a QF 850 1.40 Venturi or a QF 950 1.45 Venturi. Still small carbs compared to and old school 850 1.56 Venturi.
 
That’s a small carb for a 440. You’d be fine with a QF 850 1.40 Venturi or a QF 950 1.45 Venturi. Still small carbs compared to and old school 850 1.56 Venturi.
^^^^ yep.
Flow changes with boosters and throttle blades and shafts too so venturi size comparison might not be the only thing to look at?
 
That’s a small carb for a 440. You’d be fine with a QF 850 1.40 Venturi or a QF 950 1.45 Venturi. Still small carbs compared to and old school 850 1.56 Venturi.
I agree! I put a QF 850 on my 413 this year. I was afraid it would be too big but it’s not. Runs great. Only adjustments I made were float level and idle.
 
I have a Quick Fuel Q-750 on my 408 small block and Q-850's on my 451 and 493. I wouldn't go smaller on any of them...
 
A 750 or 780 will be fine on a street motor. It will probably have better off idle and low speed performance with the smaller size carburettor.
 
All these comments, 'runs great' etc. Compared to what?
 
All these comments, 'runs great' etc. Compared to what?
Well, I was running a 750 vac secondary. I was afraid going to an 850 mech secondary might give me a bog or stumble.
 
Well, I was running a 750 vac secondary. I was afraid going to an 850 mech secondary might give me a bog or stumble.
In times past, I often ran the venerable Holley 750 vac sec (3310) carb on stock 440's and they were pretty
much out of the box - get the jets right, set mixture and let 'er rip.

On my current 440 (the usual - cam, headers, etc.) I'm actually eyeballing the AVS2 800 cfm. Just seems
right for a street mild car.
 
I would go for the q850. I like the newer 4150 clones, currently run a brawler 950 that I got from summit's open box sale (nice to be close to a summit warehouse) on a 499 for street. Starts immediately, runs smooth, good power.
 
edelbrock avs2 800 cfm ,way better than the edelbrock 800 cfm avs
 
I’ve got a 850 Proform that was did by Thumperdart and it’s an awesome carb that I’m getting ready to sell.
 
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