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Re: Which carb?
[Re: firefighter3931]
#834798
10/21/10 12:12 AM
10/21/10 12:12 AM
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Joined: Jan 2003
Posts: 5,186
Wherever I am.
Junky
master
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master
Joined: Jan 2003
Posts: 5,186
Wherever I am.
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My turn:
383 ci
9 to 1 compression
Comp Cam XE262H (next cam size down from yours)
346 heads
Headers
727 Trans
3.73 rear gears.
I've ran the 670 Holley Street Avenger and now the 3310 Holley 750 vacuum secondary carb.
The 670 ran rich at idle. Tuned on it till I got it running good. Wasn't happy with it. Switched to the 750, did some tuning, got it working perfectly. The 750 runs great, way stronger than the 670.
I also tried the 650 and 750 Edelbrocks. Tuned on them till I was blue in the face. They are weak compared to the 670 and 750 Holley.
A little trick I did with the 670 Holley. Stuck some wire down the air bleeds to lean out the idle. But I still wasn't happy with the performance. Didn't seem to have enough umph.
If you want fuel economy, go with the 670. If you want performance, go with the 3310 Holley 750.
BTW, that cam you're running is good to 5,700 RPM's, easy.
Next.
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Re: Which carb?
[Re: Junky]
#834799
10/21/10 12:45 AM
10/21/10 12:45 AM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Its mine turn now lol, Junky, you more then likely had a bad 670 avenger with trash in the metering block/blocks, my buddy runs 11.7s with one & 60 fts. 1.61/1.62, so you can't say they won't perform because they will, the avengers were created so you could have a bit better perf. out of a VS, like i said in another thread, its "ALL" in the metering of the carb plain & simple, its really hard to have the "BEST" of both worlds without sacrifice, you either have a strip type tune or a street tune, you CAN have both with the same carb, but you'll have to play with it from track too street or vise-versa but that becomes a PITA in time. You can run a DPer on a heavy car with an auto., its done all the time, the trick is haveing "enough" gear/converter/size to make them shine. You can take a mild 440 with just bolt-ons & a mild cam, at least a 3.91 gear & 32-3400 stall in your charger, drop on an 800-850 DPer & with alittle tuneing it'll run great. With a mild 383 & just wanting a "street" car, i'd go with the 670 Avenger or a 750 3310, But i don't see you gaining much over the 600 eddy going this route "for the exspence" UNLESS your 600 eddy has an existing problem holding things back, your "stumble" is a common issue with these carbs, it "can" be cured by increasing the "squirter size", you 1st. need to make sure your float levels are "spot on" with those eddys, they are very "metering" sensitive.  And "sticking" wire down the air bleeds will NOT lean out the metering, its just the opposite  .
Last edited by joedust451; 10/21/10 12:57 AM.
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Re: Which carb?
[Re: Frederick]
#834800
10/21/10 12:53 AM
10/21/10 12:53 AM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I'd try & tune out the off idle stumble (which I hear is a common prob w them) & people being able to get either the WOT or the off idle stumble corrected but not both but both can be fixed to be right (at the same time  ) & assuming you have ground down the counterweight for the sec's to come in faster & playing w the strip kit/shooters & want the fuel levels (both sides) to be right at the notch in the float baffles (idle it for 10 seconds then pull the rods/carb top & check it). EDIT have the car on a level surface
Last edited by RapidRobert; 10/21/10 01:00 AM.
live every 24 hour block of time like it's your last day on earth
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Re: Which carb?
[Re: Frederick]
#834801
10/21/10 08:49 AM
10/21/10 08:49 AM
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Joined: Jan 2003
Posts: 5,444
Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,444
Indiana
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http://www.quickfueltechnology.com/carburetors-ss-series/street-carburetor-680-cfm-vs.html This 680cfm vacuum secondary would be my suggestion. ""jet extensions and notched float make this carburetor strip ready while 4-corner idle, electric choke, adjustable secondary housing, and screw-in air bleeds help tune it for the street"". The general debate on which carb style to use (mech vs vacuum) on what combo will be an ongoing debate. I believe that it comes down to what style of carb the individual is comfortable with tuning. I started with two Edy Performers, then I went to a Demon DP, then a Demon/Proform hybrid DP, then I went to a Promax street/strip vacuum secondary unit, and now I am using a QF Annular DP. I got comfortable with tuning the DP style carb and my car is used as 100% street toy. With the testing that I have done with the above carbs, I have come to the conclusion that paying for a carb with built-in adjustability is a must.
Last edited by YO7_A66; 10/21/10 10:13 AM.
1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
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Re: Which carb?
[Re: Boosted]
#834803
10/21/10 05:23 PM
10/21/10 05:23 PM
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Joined: Jan 2003
Posts: 8,944
Holly/MI
Dean_Kuzluzski
master
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master
Joined: Jan 2003
Posts: 8,944
Holly/MI
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This thread looks like one of those that causes more confusion than actual help.
Some appear to give more opinion as to how they would run it than to suit his intent.........
R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
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Re: Which carb?
[Re: Dean_Kuzluzski]
#834804
10/21/10 07:34 PM
10/21/10 07:34 PM
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Joined: Apr 2008
Posts: 90
NL
Frederick
OP
member
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OP
member
Joined: Apr 2008
Posts: 90
NL
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Whoa, lot's of responses and lot's of opinions. I noticed I made a slight mistake in my first post, I was looking at the Quickfuel SS series and I accidentally typed HR instead of SS. Sorry for any confusion. I did the Holley selection guide and it comes up a lot of carbs ranging from 600 to 770CFM for the vacuum and 600 to 700 for the DP. Not much help I'm afraid as I was already looking at carbs in that range. Quote:
AND, the current problem you have with that stumble can be cured by putting in lighter/thinner metering rod springs, fatter metering rods, more pump shot, different nozzles (a few are available last I checked) and..............the much overlooked mech. ignition advance (13 is good, you may need more).
Thanks, I'm sure I can tune the bog out.
The reason is probable the throttle plates are to far open at idle exposing the transfer slot.
I have adjusted the floats, they where miles off from new. I'll try your tip on how to set the float height exactly, Rapid Robert, Thanks.
Throttle discs also weren't centered very well.
However there is no point spending much time and money on it if I'm ultimately going with a different carb.
I have thought about running a TQ, but I can't find much spares and no jets or needles to tune them.
To make things easier I've looked up the throttle bore sizes on the 4 carbs and my 600 Edelbrock.
All are off course considerably larger than the Edelbrock and all SS series have 1-11/16"throttle bores, even the 650.
Looking at the venturi sizes,for me one sticks out; the 735VS
With it's 1-5/16" primary venturi and 1-7/16"secondary it has the same primary as the 650DP and 680VS but the secondary is much larger than any other.
I think this would mean relatively good fuel consumption on the primaries and power when you need it with the larger secondaries.
So I'm leaning towards this carb now.
edit: table command doesn't seem to be working here, so instead I've added a pic of the different carb specs.
Last edited by Frederick; 10/27/10 05:22 PM.
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