340, larger than stock cam (no specs), RPM Air gap, stock bottom end, headers
Looking for a Holley 750 double pumper
I think I have it narrowed down to the 4150 Street HP,
anyone run this carb on a mostly street driven car??
Opinions

650 double pumper.

IMO: I agree with above. Sounds like a street car, I'd go with a 650 street HP. The 750 might ultimately give a better ET at the drag strip with open headers, but the 650 will be better at everything else on 340 cubes. I think it would offer better throttle response and a crisper feel.

Auto with some converter or 4 speed?

If you can tune a carb, go with the 750.

I run my 340's with nothing smaller than a 750.

Its more about your conv and rear gear as to what carb
you need to use... a 750 was on a stock 340

You won't listen but 750 street demon. More throtle reponse than you will know what to do with and the air to feed it upstairs

automatic, gears are 323,
eventually I may stroke it

Stock stroke 340/auto (unknown conv)/3:23 gears= vacuum secondary with tunable circuits (jets/air bleeds). 650-700cfm

When was a 750 stock on a 340?
The square ore Carters were 600/630
Both size TQ's came on the 340 IIRC. You call them what for cfm size?
Normally I hear them called 800/850.

They had over 1000 cfm on the T/A's

Yes, the race TQ. I own one. Haven't had the chance to run it yet.
I wonder about the true cfm dry vs. wet.

Sorry, fat fingers and home distractions left this post...... Unfinished.
And yes, as stated below, the 6pack induction was a street strip champ.

See below for cfm ratings between 4 & 2 bbl. carbs.

Not that again! Two-barrel carbs are rated differently, you need to divide the two barrel rating by the square root of two (1.4142) to convert to a four barrel reading. For 1350 two barrel cfm that equates to 955 four barrel cfm. BUT, the carb setup opened the end carbs only as much as the engine needed so I don't think any stock 340 ever used all of the 6-pack capacity.

R.

Right but if you look at it this way. A motor will only draw in so much cfm of the carburetor. It doesn't matter what carb, style, or model if motor only can take in 500 cfm and you use a 650 then what? Is it to big now? You can run any carb you want but if it's a street set up then who gives a turkey about size really lol. As long as motor is getting fuel and is working like it's supposed to.

Street car, mild 340. You might consider a 650 vacuum secondary. Is it an automatic? I didn't see that noted.

I'd love to own the competition series TQ (1000 cfm), but those are like hen's teeth

I used this 750 Holley choke less race carb with good results in my 400hp 360.

But this mechanical 6 pack setup replaced the 4bbl and single plane. The engine seems slightly stronger with the 6 pack even with the 1,150cfms and no jetting!