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Carb shopping #1726628
01/10/15 07:56 PM
01/10/15 07:56 PM
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pacific northwest
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Stroker Scamp Offline OP
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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


footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip
73 Duster 340 street strip 12.79 @ 105
Re: Carb shopping [Re: Stroker Scamp] #1726629
01/10/15 08:17 PM
01/10/15 08:17 PM
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Florida
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johnmilner Offline
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650 double pumper.

Re: Carb shopping [Re: johnmilner] #1726630
01/10/15 09:04 PM
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Puyallup, WA
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StealthWedge67 Offline
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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.



LemonWedge - Street heavy / Strip ready - 11.07 @ 120
Re: Carb shopping [Re: Stroker Scamp] #1726631
01/10/15 09:10 PM
01/10/15 09:10 PM
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RobX4406 Offline
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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.

Re: Carb shopping [Re: Stroker Scamp] #1726632
01/10/15 09:13 PM
01/10/15 09:13 PM
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Romeo MI
MR_P_BODY Offline
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Its more about your conv and rear gear as to what carb
you need to use... a 750 was on a stock 340

Re: Carb shopping [Re: StealthWedge67] #1726633
01/10/15 09:46 PM
01/10/15 09:46 PM
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Denison,Ia.
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Cuda367 Offline
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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

Re: Carb shopping [Re: Cuda367] #1726634
01/10/15 10:22 PM
01/10/15 10:22 PM
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pacific northwest
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Stroker Scamp Offline OP
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automatic, gears are 323,
eventually I may stroke it


footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip
73 Duster 340 street strip 12.79 @ 105
Re: Carb shopping [Re: Stroker Scamp] #1726635
01/10/15 11:57 PM
01/10/15 11:57 PM
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Indiana
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YO7_A66 Offline
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Stock stroke 340/auto (unknown conv)/3:23 gears= vacuum secondary with tunable circuits (jets/air bleeds). 650-700cfm


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.) Solid FT, Yella Terra 1.65 rockers, 9.7:1, 63cc Sidewinders (Bowl Ported),RPM intake, QF SS-750 Annular DP, MSD Street Fire Ign., & TTI's. 727/Dynamic 9.5" 3800, TF-2, & 3:91's
Re: Carb shopping [Re: MR_P_BODY] #1726636
01/13/15 08:25 PM
01/13/15 08:25 PM
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Earth
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Rob C Offline
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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.

Re: Carb shopping [Re: Rob C] #1726637
01/13/15 08:31 PM
01/13/15 08:31 PM
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In a house near you
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Street Monkies Offline
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They had over 1000 cfm on the T/A's

Re: Carb shopping [Re: Street Monkies] #1726638
01/13/15 08:39 PM
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Rob C Offline
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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.

Last edited by Rob C; 01/13/15 08:50 PM.
Re: Carb shopping [Re: Street Monkies] #1726639
01/13/15 08:39 PM
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dogdays Offline
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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.

Re: Carb shopping [Re: dogdays] #1726640
01/13/15 08:58 PM
01/13/15 08:58 PM
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Street Monkies Offline
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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.

Re: Carb shopping [Re: Cuda367] #1726641
01/13/15 08:59 PM
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DaveRS23 Offline
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Quote:

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




(except for the 750 part) The Double Pumpers are awful rich when used on a street car unless lots of time is spent tuning them. They are good carbs, but are more geared toward acceleration competitions than cruising.

The Demons start much more street friendly on their tune. If adjustments are needed, they are fewer and typically take fewer steps.

And besides the tune, the Demons also have some street friendly design features that the Holleys don't. Which will also help throttle response and driveability.

If you are choosing for the strip, then I would probably choose the 750 DP. But for the street, the 625 Street Demon should get the nod.





KOS
Re: Carb shopping [Re: Stroker Scamp] #1726642
01/15/15 11:40 PM
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Mopar Bob Offline
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Street car, mild 340. You might consider a 650 vacuum secondary. Is it an automatic? I didn't see that noted.

Re: Carb shopping [Re: Mopar Bob] #1726643
01/16/15 02:28 AM
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VincentVega Offline
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I'd love to own the competition series TQ (1000 cfm), but those are like hen's teeth


Looking for 1975 through 1978 B body 4 door sedan sheet metal or parts cars - monaco, fury, coronet. Please let me know
Re: Carb shopping [Re: VincentVega] #1726644
01/16/15 04:30 AM
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ademon Offline
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I used this 750 Holley choke less race carb with good results in my 400hp 360.

Re: Carb shopping [Re: ademon] #1726645
01/16/15 04:37 AM
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ademon Offline
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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!

Re: Carb shopping [Re: ademon] #1726646
01/16/15 04:38 AM
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Re: Carb shopping [Re: ademon] #1726647
01/16/15 04:42 AM
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RobX4406 Offline
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Quote:

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!




~813 cfm in 4 bbl terms.

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