Anyone running a Quick fuel carb on a 440?

[Moms68]

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.

 

[68 HEMI GTS]

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.

 

[RemCharger]

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?

 

[padam]

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.

 

[hunt2elk]

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...

 

[steve340]

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.

 

[Geoff 2]

All these comments, 'runs great' etc. Compared to what?

 

[padam]

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.

 

[moparedtn]

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.

 

[SlinktRR]

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.

 

[gtxrt]

edelbrock avs2 800 cfm ,way better than the edelbrock 800 cfm avs

 

[70ChargerRT]

I’ve got a 850 Proform that was did by Thumperdart and it’s an awesome carb that I’m getting ready to sell.