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500 CI RB SIX PACK HELP #1792782
03/31/15 07:37 PM
03/31/15 07:37 PM
Joined: Nov 2008
Posts: 85
Washington PA
6
69 plymouth rnr Offline OP
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Joined: Nov 2008
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Washington PA
Im having trouble setting up my stroker six pack, jets,meetering plates,ect list of parts
new hollry carbs
new ported intake
640 solid lift cam / 256 duration HUGHES
APROX 11.2.1 COMPRESSION
EDDY RPM PORTED 2.19 INT
Any help dialing in is appreciated.
Thanks Nick

Re: 500 CI RB SIX PACK HELP [Re: 69 plymouth rnr] #1792783
03/31/15 08:40 PM
03/31/15 08:40 PM
Joined: Mar 2010
Posts: 939
glendora, ca.
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Deepockets Offline
super stock
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glendora, ca.
What are the issues That your having?

Re: 500 CI RB SIX PACK HELP [Re: Deepockets] #1792784
03/31/15 08:59 PM
03/31/15 08:59 PM
Joined: Sep 2004
Posts: 6,906
IL, Aurora
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ademon Offline
master
ademon  Offline
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IL, Aurora
Well you need a good steady 5 to 6 psi to carbs. With all that big HP I would jet the center carb up around 68 to 70 to start.

Re: 500 CI RB SIX PACK HELP [Re: ademon] #1792785
03/31/15 09:51 PM
03/31/15 09:51 PM
Joined: Nov 2008
Posts: 85
Washington PA
6
69 plymouth rnr Offline OP
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69 plymouth rnr  Offline OP
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Washington PA
it is totally differnt from the way it was before the change ,no power sounds differnt . just put 70 jet in the center. i also hear people talk about pro max but one gentelman I know had problems with the floats hitting their plates?

Re: 500 CI RB SIX PACK HELP [Re: 69 plymouth rnr] #1792786
03/31/15 10:25 PM
03/31/15 10:25 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Cab_Burge Offline
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Which version of sixpak carbs do you have? 440, 340, OEM or new replacement vacume carbs. for which year application? Which list part # and list # are your carbs. ? It makes a difference on how to tune them Also do you know if the vacume pod springs are stock and do you know if the new cam was degreed in or not? I ran several different sixpak motors and sixpak combination in my old pump gas street car Last thing is are you running a power valve in the center carb. or not? Sixpaks(set up properly) rock


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 500 CI RB SIX PACK HELP [Re: Cab_Burge] #1792787
03/31/15 10:33 PM
03/31/15 10:33 PM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
Mr.Yuck  Offline
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
FWIW I run a 11.2:1 440-6. I run 35 squirters, 70 mains (probably too much). 4.5PV and purple springs. 588 solid roller. The car will stand up and boil the hides as long as I want. What is the issue you'd like to solve?


[IMG]http://i66.tinypic.com/pui5j.jpg[/IMG]
Coming soon!!!!
Re: 500 CI RB SIX PACK HELP [Re: Mr.Yuck] #1792788
04/01/15 01:08 AM
04/01/15 01:08 AM
Joined: Jun 2003
Posts: 9,225
Charleston
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sixpackgut Offline
Drag Week Mod Champion
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Charleston
Lock your timing at 36*
70 jet is to much. I ran 65
The floats hit the promax plates when I got them.
Run a 6.5 PV.
Adjust your af scews on front carb and set the rear the same
Put a 50cc pump and 35 squirter. Dont mess with the pod springs
You can change jetting on the outboard with a drill bit. I had mine similar to what is in the old DC race manual


Gen 3 power 6.22@110, 9.85@135
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performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
Re: 500 CI RB SIX PACK HELP [Re: sixpackgut] #1792789
04/01/15 09:55 AM
04/01/15 09:55 AM
Joined: Oct 2008
Posts: 411
Harleysville, PA USA
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Tommy D Offline
mopar
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Posts: 411
Harleysville, PA USA
My Promaxx jet plates work great. I did have issues with new needle and seats. They seemed to pull out of the threaded portion of the fuel bowls. These were Holley parts, not made in China. I had to have all three floats bushed with a brass insert. My biggest problem with my six pack was keeping the floats set correctly. If they are not, nothing else really matters. Are your floats set correctly? Next biggest issue is the air fuel mix. Once these two are dialed in, you can fine-tune your jet selection or drill the plates. A buddy of mine drilled his stock metering plates and tapped them to insert Holley jets. It works good for him. Cheam man's Promaxx plates.

Re: 500 CI RB SIX PACK HELP [Re: Tommy D] #1792790
04/01/15 07:41 PM
04/01/15 07:41 PM
Joined: Nov 2008
Posts: 85
Washington PA
6
69 plymouth rnr Offline OP
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Washington PA
Ok guys the carbs are brand new from summit on sale around christmas not sur of the numbers or application . i did buy a spring kit and am in the prossess of using the yellow springs .because they are the lightest and i have low vaccume . I leaning to buyimg the quick fuel plates and block so no drilling just jets . also I m having a hard time doing anything because i cant keep it running long enough to check timing , floats ect...

Re: 500 CI RB SIX PACK HELP [Re: 69 plymouth rnr] #1792791
04/01/15 07:47 PM
04/01/15 07:47 PM
Joined: Nov 2008
Posts: 85
Washington PA
6
69 plymouth rnr Offline OP
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69 plymouth rnr  Offline OP
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Joined: Nov 2008
Posts: 85
Washington PA
UPDATE!!!! HOLLEY 4792 AND 4790 CARBS
AND YES POWER VALVE MIGHT TRY A 2.5

Re: 500 CI RB SIX PACK HELP [Re: 69 plymouth rnr] #1792792
04/01/15 07:50 PM
04/01/15 07:50 PM
Joined: Jun 2003
Posts: 9,225
Charleston
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sixpackgut Offline
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Charleston
Quote:

Ok guys the carbs are brand new from summit on sale around christmas not sur of the numbers or application . i did buy a spring kit and am in the prossess of using the yellow springs .because they are the lightest and i have low vaccume . I leaning to buyimg the quick fuel plates and block so no drilling just jets . also I m having a hard time doing anything because i cant keep it running long enough to check timing , floats ect...




The timing light works even when its not running assuming the plugs are firing.

The pod springs dont care what engine vac is


Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram

performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
Re: 500 CI RB SIX PACK HELP [Re: sixpackgut] #1792793
04/01/15 10:27 PM
04/01/15 10:27 PM
Joined: Nov 2008
Posts: 85
Washington PA
6
69 plymouth rnr Offline OP
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69 plymouth rnr  Offline OP
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Joined: Nov 2008
Posts: 85
Washington PA
Ok , well im going to put the light on to when its running ,and the springs are just one of the things im throwing at it .When it goes back together this weekend it will be as follows....
quick fuel plates
70 jets in center
50cc pump
blue cam
2.5 power valve
84 jets front and rear
and go from here ?

Re: 500 CI RB SIX PACK HELP [Re: 69 plymouth rnr] #1792794
04/01/15 10:36 PM
04/01/15 10:36 PM
Joined: Mar 2007
Posts: 2,230
restos just aren't my thing
gtsuperbee Offline
top fuel
gtsuperbee  Offline
top fuel

Joined: Mar 2007
Posts: 2,230
restos just aren't my thing
So many things to check. start with just making sure they open and close completely (each one by themselves) when you bolt them down. The can hang up on gasket material easily and make sure all your linkage is functioning correctly before you even start to tune. Also, keep in mind, all 3 carbs work as one for tuning, meaning you can't just make a set of block off plates for the outboard carbs and start tuning just the center carb.


Restoring a car to look "only" as good as the factory made it is like getting a boob job for your wife and having the doctor make them two different sizes to seem more natural
Re: 500 CI RB SIX PACK HELP [Re: gtsuperbee] #1792795
04/01/15 10:51 PM
04/01/15 10:51 PM
Joined: Nov 2008
Posts: 85
Washington PA
6
69 plymouth rnr Offline OP
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69 plymouth rnr  Offline OP
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Joined: Nov 2008
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Washington PA
yeah im checking everything it just a prosses im trying to learn .its all moving freely ,the problem was no power it was surging .stumbling will not idle .... these carbs were not designed to be on this engine without some work

Re: 500 CI RB SIX PACK HELP [Re: 69 plymouth rnr] #1792796
04/02/15 01:07 AM
04/02/15 01:07 AM
Joined: Oct 2005
Posts: 1,305
Lakewood, Colorado
herkamer Offline
pro stock
herkamer  Offline
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Joined: Oct 2005
Posts: 1,305
Lakewood, Colorado
Been fighting some of the same issues with mine on the 360. I have a pretty radical cam which I don't know the specs on. They need more fuel at idle, I am 2 turns out on the outboard needles and it's still a bit lean. Runs much better and tamed the idle with more fuel. With the jettable plates you might be able to circumvent some of that.

Read the old article about halfway down this page:
http://www.mopar1.us/6barreltips.html
It's 7 pages and really details the theory of operation and good tuning tips.


Matt
69 Dart Swinger 340
83 W350, Megasquirted with 46RH
Old news: 72 Demon street/race mobile
Latest: 70 Duster backhalf car
and even more
Re: 500 CI RB SIX PACK HELP [Re: 69 plymouth rnr] #1792797
04/02/15 01:08 AM
04/02/15 01:08 AM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
Quote:

UPDATE!!!! HOLLEY 4792 AND 4790 CARBS
AND YES POWER VALVE MIGHT TRY A 2.5


Do these carbs. have the List #4790 and List # 4792 or are they List # 4790-1 or -2 and 4792-1 or -2 or no dash numbers after the list numbers? The reason I'm asking is the original OEM carbs did not have dash #s, only the later Holley replacement carbs have the -1 or -2 #s after the list numbers. I have had expereinces with both types and the later -1 and -2 are harder to get them dialed in and running good I saw that you had bought them from Summit recently so you can count on them being the later replacement -1 and -2 carbs Holley made, not the early ones Ma Mopar bought and installed on the cars back when What is the center carb. List #? I have seen many guys on this web site advice using combinations of jets and squirters that would not work on any of the sixpak set ups I have tuned and used on street cars out here and in SO CA My message here is the place you live and work on your car at can have a direct effect on what tuning your carbs. need I live west of the Rocky Mtns at 3500 + ft altitude, the humidity here is a bunch lower than the same elevation in many states east of the rockies, humidity plays a big factor on how close the oxygen molicules are in the air where you live and drive Same thing on barometric pressures and temperatures. BTW, all us drag racers and Hi Po Mopar street guys west of the rockies suck all the good air out of the atomsphere before we let it circulate back east, right Thumper, Triple Threat and Jeremiah It is still 04-01-2015,isn't it


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 500 CI RB SIX PACK HELP [Re: Cab_Burge] #1792798
04/02/15 07:45 PM
04/02/15 07:45 PM
Joined: Nov 2008
Posts: 85
Washington PA
6
69 plymouth rnr Offline OP
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69 plymouth rnr  Offline OP
member
6

Joined: Nov 2008
Posts: 85
Washington PA
Cab here is what i can tell you when i got the carbs mounted to run the lines NOTHING was tight on these cabs every nut bolt screw and when i pulled the vac line off to move some stuff around the vac tube pulled out !! talk about a pain in the butt . These carbs are new and definitly not MADE IN AMERICA !!! And yes im in the pittsburgh PA area so yes bad air and lots of humidity. Butas far as the carbs go im gonna use all the info im getting till i get her dialed in

Re: 500 CI RB SIX PACK HELP [Re: 69 plymouth rnr] #1792799
04/03/15 04:46 PM
04/03/15 04:46 PM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
Mr.Yuck  Offline
Not enough dumb comments...yet

Joined: Jan 2003
Posts: 24,562
Brookeville, Md
sorry you are having issues, I put my stuff on right out of the box and it worked fine. Try one thing at a time. to set you timing unhook the outboards, turn the idle up to 2400 and set your timing at 36*. Then back the rpms down to 900 or so and adjust for best vacuum. Then shut the car off and hook up the outboards. have somebody get in the car and floor it. Make sure all 3 are wide open. Take a ride. FWIW I'm pulling about 10hg at 950. I run a 4.5PV. I have the stock carbs and stock intake.

Re: 500 CI RB SIX PACK HELP [Re: Mr.Yuck] #1792800
04/03/15 10:16 PM
04/03/15 10:16 PM
Joined: Nov 2008
Posts: 85
Washington PA
6
69 plymouth rnr Offline OP
member
69 plymouth rnr  Offline OP
member
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Joined: Nov 2008
Posts: 85
Washington PA
Thanks , what is your combo ??

Re: 500 CI RB SIX PACK HELP [Re: Mr.Yuck] #1792801
04/04/15 02:24 AM
04/04/15 02:24 AM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
Quote:

. Then shut the car off and hook up the outboards. have somebody get in the car and floor it. Make sure all 3 are wide open.


I've never seen any vacume actuated six pak open when in nuetral at WOT, with the motor running or not OP, sixpaks will barely start to open the outboards when hitting the throttle to wide open, by the time the motor builds up enough manifold CFM flow to actuate the vacume secondary pods the motor will be revved way higher than you want to hear


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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