Re: Stock six pack carb setups on stroker engines
[Re: domingo]
#1916509
09/21/15 02:54 AM
09/21/15 02:54 AM
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Joined: Aug 2003
Posts: 43,127 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,127
Bend,OR USA
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I had three different sets of Holley six pak carbs that I dyno tested on my pump gas 400 block pump gas 511 C.I. storker motor, the 1971 stock 440 carbs opened to soon so I had to change the outboard vacume pod springs to slow it down so it wouldn't bog They, six paks, rock on the street once you get them dialed in close I would remove the lead plugs on the outboard carbs to get to the idle mixture screws and turn them in gently to bottom them out and then unscrew them to 1/3 to 1/2 turn out from bottomed out and then use the center car. idle mixture screws for the final tuning Let us know how you like them
Last edited by Cab_Burge; 09/21/15 02:55 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Stock six pack carb setups on stroker engines
[Re: Cab_Burge]
#1916522
09/21/15 03:27 AM
09/21/15 03:27 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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They, six paks, rock on the street once you get them dialed in close that's what I hear, I cant afford one myself but Domino I would jump right in & post how it turns out for you
live every 24 hour block of time like it's your last day on earth
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Re: Stock six pack carb setups on stroker engines
[Re: domingo]
#1916781
09/21/15 03:33 PM
09/21/15 03:33 PM
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Joined: May 2006
Posts: 197 Milwaukee, WI
moparjimbo
member
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member
Joined: May 2006
Posts: 197
Milwaukee, WI
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I ran one on a 496 with Indy SR heads a few years ago. Changed the secondary vacuum springs as someone suggested, and someone I cannot recall who makes aftermarket secondary metering blocks that allow adjustment that I am sure you could find googling.... Been awhile so its from memory sorry.
Worked fine, but I think the issue is more with the manifold depending on how serious you are and your cam etc you give up a good chunk of HP on the top end. I know comparing the SR head intake ports to the manifold ports it was a HUGE size difference alone, not to mention the dual plane design. As a result I had what I considered some very decent overall power and low end, but had a disappointing peak HP number...
1996 Viper GTS - UGR Twin Turbo 1500RWHP, 9.02 @ 167 on pump gas and DOT tire 1973 Challenger - 572 Indy Hemi 860HP 1975 Trailduster Convertible, 440 1967 Plymouth Fury Police Pursuit 2DR 505 Stroker 2004 Neon SRT4 modded www.milwaukeemopar.com
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Re: Stock six pack carb setups on stroker engines
[Re: domingo]
#1916783
09/21/15 03:35 PM
09/21/15 03:35 PM
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Joined: May 2006
Posts: 197 Milwaukee, WI
moparjimbo
member
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member
Joined: May 2006
Posts: 197
Milwaukee, WI
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So on a "street" car with a reasonable converter and gears etc it worked great but on a "drag" car with a big converter, gears, cam where you are looking to make nothing but top end power I think you give up a lot versus a single plane and big single 4 barrel.
1996 Viper GTS - UGR Twin Turbo 1500RWHP, 9.02 @ 167 on pump gas and DOT tire 1973 Challenger - 572 Indy Hemi 860HP 1975 Trailduster Convertible, 440 1967 Plymouth Fury Police Pursuit 2DR 505 Stroker 2004 Neon SRT4 modded www.milwaukeemopar.com
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Re: Stock six pack carb setups on stroker engines
[Re: moparjimbo]
#1916826
09/21/15 04:46 PM
09/21/15 04:46 PM
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Joined: Mar 2007
Posts: 3,277 West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,277
West Coast, USA
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I have the DC mechanical carbs on a Hughes deep-ported factory-style aluminum sixpack intake on my 493" stroker motor. The combo can make some impressive top end power when set-up right. Since the motor was dynoed, I've upgraded the rocker arms to 1.6 to 1 ratio T&D's with Manton pushrods. It gave me about .050" more lift and a touch more power everywhere especially on the top end. The motor still wants more cam, but I don't want to give up the power on the bottom end. It street driven 99% of the time, and already rev's like a small block. Here are my dyno sheets contrasting the sixpack's performance with a big 4 barrel carb and intake. These numbers are with .050" less lift than it has now, but it is still a pretty healthy street engine. http://www.hughesengines.com/TechArticles/3dynotest684hp500cid6pack4bbljcross012007.php
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: Stock six pack carb setups on stroker engines
[Re: AndyF]
#1918143
09/23/15 04:02 PM
09/23/15 04:02 PM
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Joined: Mar 2005
Posts: 792 Earth
Rob C
super stock
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super stock
Joined: Mar 2005
Posts: 792
Earth
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It isn't the carbs that kill off the power in a six pack setup it is the twists and turns inside of the stock intake. The porting helps and with a smaller cam like JBC has the numbers are close. In a street engine the dual plane design really helps with the low end torque. Flip over to a race engine and the dual plane kills off the high end power.
The NHRA super stock guys run the Holley carbs (required by rules) but they use custom sheet metal intakes. Those engines wind to the moon and make a ton of power. So it isn't the carbs, it is the manifold. And the manifold is just fine for street use. This..^^^^, in a big way Iagree. The small block intake has tall stands for the carbs and creates a deep deep long drop to the bottom plane. There's sharp turns there. Also, you can see how the #1 cylinder runner is kind of a up and down slope runner, to low IMO. Like Andy said, it is a dual plane. That itself is a limitation. Excellent for the street, street strip car. Also know that the old Direct Connection carbs flowed more than the OEM set did/does.
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Re: Stock six pack carb setups on stroker engines
[Re: Droop69]
#1918145
09/23/15 04:03 PM
09/23/15 04:03 PM
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Joined: Mar 2005
Posts: 792 Earth
Rob C
super stock
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super stock
Joined: Mar 2005
Posts: 792
Earth
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You could always try one of these. Fits under a 69 1/2 lift off hood! Want.... Neeeed ...... Want ..... Neeeeeeed .... Want ... Drool on cool wacko factor... LMAO
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Re: Stock six pack carb setups on stroker engines
[Re: domingo]
#1918449
09/23/15 10:54 PM
09/23/15 10:54 PM
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Joined: Aug 2003
Posts: 2,466 Answering the call of the wild
ThermoQuad
top fuel
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top fuel
Joined: Aug 2003
Posts: 2,466
Answering the call of the wild
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Hello! Just wondering how does a bone stock set of six pack carburetors would work on a stroker 440 with stealth heads and a hotter cam. Will they work or will they be totally off??? What about on stroked small blocks??? Are the non adjustable idle needles (plugged) on the stock outboard carbs a problem? Do they need to be adjusted on stroker motors? All six packs require a basic "set up" even stock. The variable in the set up is only the jetting on the center carb. Once the base line is set and the car tuned, the jetting is adjusted if necessary and then the 2ndary springs are changed if required. Get the 6 pk tuning guide & use it. As for the rest of you bad mouthing the intakes because the peak the peak hp blah blah blah - this is not the race section and no one has 690 hp engines. Some of us have had great success making great hp & torque with six paks on small and big block stokers. 416/505 Since you six pak peak hp, poorly designed manifold guys never got a ride in any of our rocket ships you don't know what you missed. Any stoker street engine loves a six pak - it's like an unlimited shot of nitrous.
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Re: Stock six pack carb setups on stroker engines
[Re: domingo]
#2774391
05/14/20 06:19 AM
05/14/20 06:19 AM
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Joined: Apr 2019
Posts: 1 Montreal Canada
Maps
member
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member
Joined: Apr 2019
Posts: 1
Montreal Canada
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I just can't get my carbs running will always too too too rich. My kingdom for Any help
In God We Trust, Everyone Else, Pays Cash.
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Re: Stock six pack carb setups on stroker engines
[Re: Maps]
#2774487
05/14/20 12:25 PM
05/14/20 12:25 PM
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Joined: Jan 2003
Posts: 24,562 Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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I just can't get my carbs running will always too too too rich. My kingdom for Any help have you checked the float levels? What springs? Is it from the primary or outboards? When I 1st set up my 1st 6-pack I unhooked the outboards. I adjusted the primary like any other crab, then messed around with the springs and things. What jets are you running? squiters?
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