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Stock six pack carb setups on stroker engines #1916323
09/20/15 09:11 PM
09/20/15 09:11 PM
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Lima, Peru
domingo Offline OP
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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?

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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Bend,OR USA
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Cab_Burge Offline
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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 scopeThey, six paks, rock on the street once you get them dialed in close up 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 thumbs twocents Let us know how you like them work

Last edited by Cab_Burge; 09/21/15 02:55 AM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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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Lincoln Nebraska
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RapidRobert Offline
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Quote:
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
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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Milwaukee, WI
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moparjimbo Offline
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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
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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Milwaukee, WI
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moparjimbo Offline
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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
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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West Coast, USA
jbc426 Offline
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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

Cuda 2.jpg

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)
Re: Stock six pack carb setups on stroker engines [Re: domingo] #1916869
09/21/15 05:52 PM
09/21/15 05:52 PM
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Oregon
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AndyF Offline
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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.

Re: Stock six pack carb setups on stroker engines [Re: domingo] #1917049
09/21/15 10:01 PM
09/21/15 10:01 PM
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Lima, Peru
domingo Offline OP
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Lots of good info!!!

I wonder what involves the "deep porting" of a stock six pack intake manifold?

Re: Stock six pack carb setups on stroker engines [Re: domingo] #1917062
09/21/15 10:25 PM
09/21/15 10:25 PM
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Droop69 Offline
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You could always try one of these. Fits under a 69 1/2 lift off hood!

6-29-14 153.JPG6-29-14 152.JPG
Re: Stock six pack carb setups on stroker engines [Re: Droop69] #1917240
09/22/15 08:19 AM
09/22/15 08:19 AM
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Jacksonville Fl
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70BigBlockSE Offline
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fits under a Challenger TA hood also

IMG_0249.jpg
Re: Stock six pack carb setups on stroker engines [Re: domingo] #1917435
09/22/15 02:48 PM
09/22/15 02:48 PM
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Ohio
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70BIRD Offline
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Nick Wilson built my 493 stroker with ported SR's, 12:1 compression, roller cam, and Hughes did a stage 2 porting on my manifold. On the dyno it made 734 HP at 6950 rpm so seems like the manifold is flowing well.

Re: Stock six pack carb setups on stroker engines [Re: AndyF] #1918143
09/23/15 04:02 PM
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Rob C Offline
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Originally Posted By AndyF
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.

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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Rob C Offline
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Originally Posted By Droop69
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

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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Answering the call of the wild
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ThermoQuad Offline
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Originally Posted By domingo
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.eek

Any stoker street engine loves a six pak - it's like an unlimited shot of nitrous.




Re: Stock six pack carb setups on stroker engines [Re: domingo] #1918492
09/23/15 11:48 PM
09/23/15 11:48 PM
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IL, Aurora
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ademon Offline
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I didn't notice any loss in top end and did gain a little low and mid range on my 400 hp 365" SB. I'm using a deep port matched mopar intake with the DC mechanical 6 pack. I can actually flat out floor it and open all 6 barrels at once and it goes like it was shoot out of a canon !! It does have a 4,400 rpm stall with drag radials. Plus the WOW factor over the single 4 bbl is worth it IMHO.

Re: Stock six pack carb setups on stroker engines [Re: domingo] #1924077
10/02/15 12:47 PM
10/02/15 12:47 PM
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Lima, Peru
domingo Offline OP
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Where do I get the 6 pack tuning guide?

Re: Stock six pack carb setups on stroker engines [Re: domingo] #1924086
10/02/15 01:05 PM
10/02/15 01:05 PM
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Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
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ask Cab...
I'd say they'd work just fine. You will have to adjust them but you'd have to adjust any carb you'd use.


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Coming soon!!!!
Re: Stock six pack carb setups on stroker engines [Re: domingo] #1924088
10/02/15 01:08 PM
10/02/15 01:08 PM
Joined: Jan 2003
Posts: 9,670
Lima, Peru
domingo Offline OP
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Lima, Peru
IM THINKING ABOUT GETTING ONE OF THOSE LM1s

trying to adjust carbs without anything like that is just pure guesswork....or LOTS OF WORK AND TIME ....reading sparkplugs and stuff....which I dont really have time for...

I just wanna be sure Im starting with a good baseline and then tuning from there....

I will start with stock jetted and setup carbs. then go from there.

I think those LM1s are no longer available, and now there is a new version out.....but I heard abhout people saying that their new version is no good?

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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Montreal Canada
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Maps Offline
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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.
Re: Stock six pack carb setups on stroker engines [Re: Maps] #2774487
05/14/20 12:25 PM
05/14/20 12:25 PM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
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Brookeville, Md
Originally Posted by Maps
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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