holley direct connection 4782 4783 mechanical six pack carburetors

[high perf mopar]

installing the old direct connection holley 4782 center 4783 outers on my 440. looking for any tips/thoughts from any body using them..
currently running stock/new replacement  vacuum secondary units..highly modified with promax jet plates and butterfly plates////for sale..
just rebuilt them using n.o.s. fuel bowls and a center metering plate 134-276 holley...jetted it with same jets as my vacuum unit...78 outers,,68 center..3.5 power valve..31 squirters..waiting for the linkage from promax..
motor,,440,30 over flat tops,iron heads 906,2.14/1.81.555 lift c.c.solid lifter.306 duration.3500 stall. 20 degrees intial..34 total..
any input would be app.  did not like the lag between 1st and secondarys,,,personally i think on the street its dangerous when one is not monitoring the rpm's,,i want my right foot to dial my fun..
thanks

[Chryco Psycho]

sounds like the center carb was set too rich usually 62-64 is normal , di you buy the spring kits & change springs in the secondaries , too light & they will lag as they open to fast for the vacuum in the manifold is too low to draw in fuel .

[high perf mopar]

sounds like the center carb was set too rich usually 62-64 is normal , di you buy the spring kits & change springs in the secondaries , too light & they will lag as they open to fast for the vacuum in the manifold is too low to draw in fuel .

im using the 68/78 jet combo because thats what im running now and the plugs r tannish/blackish.lol,

yes,the springs in the secondarys were changed also.im running the next to the litest there were,,silver i believe..it didnt bog at all,,in fact with these vacuum carbs when they open it really gets it on,,i mean with this motor combo it really snarls!!for lack of a better term BUT,they wont open with out engine rpm/vacuum===lag..thats where/should these r going to shine once i get them set up..they should be close now,,i think the trick will be setting the linkage up for the outboards to open,,i will intially pattern them after the 750 double pumper linkage that i have on my other engine..   

[Road_Runner]

I've got an NOS six pack setup with the mechanical outer carbs.  They were originally bought from a Chrysler dealer around 1980 and been sitting on a shelf ever since.  One thing that has me wondering about these is the fact that all three carbs open simultaneously, there's no delay in the outer carbs at all.  I'm thinking that is going to make feathering the throttle a mandatory skill for anything other than a high rpm launch.  I believe these were intended as a race only setup but who knows.  If you end up going this route yourself I'd really like to hear about your experience with these on the street, around town, etc.

Later, Jim

[Chryco Psycho]

I prefer the mechanical system , you can control he opening far better with your foot than trying to get the vacuum to open them smoothly , this is the system I now have on my Challenger

[high perf mopar]

I prefer the mechanical system , you can control he opening far better with your foot than trying to get the vacuum to open them smoothly , this is the system I now have on my Challenger

REALLY!
how do u have them set up?jets?squirters?pump cams?throttle linkage?fuel logs?pics??ANY info would be greatly app..mine r rebuilt and on the car now..i will have to notch my shaker base plate to clear the front carb fuel inlet fitting,,should be pretty straight forward..waiting on promax for the linkage kit they make and fuel log..i'll be calling them 1st a.m. tomorrow..

chrysler actually listed them as an upgrade for the six pack setups when they offerd them...thanks tony.

[high perf mopar]

I've got an NOS six pack setup with the mechanical outer carbs.  They were originally bought from a Chrysler dealer around 1980 and been sitting on a shelf ever since.  One thing that has me wondering about these is the fact that all three carbs open simultaneously, there's no delay in the outer carbs at all.  I'm thinking that is going to make feathering the throttle a mandatory skill for anything other than a high rpm launch.  I believe these were intended as a race only setup but who knows.  If you end up going this route yourself I'd really like to hear about your experience with these on the street, around town, etc.

Later, Jim

i think progressive linkage is def in order here,thats how im going to set up mine,just like the 750 double pumper i have laying around..adj so i can play with opening rates on the secondarys..i def am going this route where as i have my vacuum units listed on ebay right now.http://www.ebay.com/itm/280799578732?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2648  .chrsyler act listed them as an upgrade for the six pack cars back in the day..but very little info flying around on these..if u want to sell them let me know..but after i get it running in the next few weeks i let u know how they run..im pretty sure there going to be really good after some fine tuning,,

[Road_Runner]

I prefer the mechanical system , you can control he opening far better with your foot than trying to get the vacuum to open them smoothly , this is the system I now have on my Challenger

That's interesting to hear you're running manual secondaries, too. Like 440 said, I would have thought a progressive opening on the outer carbs would be better on the street letting you run just off the middle carb for low part-throttle.  Is yours like mine with all three carbs opening together or some kind of progressive linkage?  And also like 440, I'd appreciate any tuning tips you could share making these work on the street.

Thanks, Jim

[Chryco Psycho]

That's interesting to hear you're running manual secondaries, too. Like 440 said, I would have thought a progressive opening on the outer carbs would be better on the street letting you run just off the middle carb for low part-throttle.  Is yours like mine with all three carbs opening together or some kind of progressive linkage?  And also like 440, I'd appreciate any tuning tips you could share making these work on the street.

Thanks, Jim

Mine have a slider link on the center carb so I get approx 30% on the middle carb before the outboards come in . These are actually easy to make if you have 3 parts  , the 2 end carbs are connected together with 1 rod , you need the nuts that fit the arm on the lever , then the link from the center carb hooks over the other link connecting the two end carbs , you need a nut on the center link , this can be welded on so the hook from the center carb will hit the nut & pull the end carbs open so all three should be wide open at the same time , the center carb should have the link higher up so the travel is longer , the end carbs should be closer to the pivot so the throw is shorter . sorry I do not have any pix , my car is back in Canada & I am living in Panama .
 You should be able to create a hard fuel line down from the front carb without notching the air cleaner base , I did my system this way .

[Chryco Psycho]

I never got mine dialed in properly but 64 jets in the middle with a 27 squirter & 3.6 power valve due to the cam I am using . the end carbs are 78 jets I believe with a 32 squirter . I built my own tubular fuel lines with hand bent 3/8 lines & brass tees , it seemed to run well on the middle carb but stumbled on the outboards but I may have punched it at too low RPM , or I may need larger outboard squirters .
 Sorry no pix handy
 Neil

[high perf mopar]

I never got mine dialed in properly but 64 jets in the middle with a 27 squirter & 3.6 power valve due to the cam I am using . the end carbs are 78 jets I believe with a 32 squirter . I built my own tubular fuel lines with hand bent 3/8 lines & brass tees , it seemed to run well on the middle carb but stumbled on the outboards but I may have punched it at too low RPM , or I may need larger outboard squirters .
 Sorry no pix handy
 Neil

or u needed a higher stall converter,,im setting mine up with a 3.5 power valve(c.c.555 lift 306 dur.260@50 solid lifter)5 inches vacuum in gear..31 squirters center and outers,,68 jets center,78 outers..white plastic high lift pump cam..no slopp between cam and acc pump arm.3500 stall converter..30cc pumps,,will go from there.if it stumbles or bog/back fire will jet up and increase squirters and/or 50cc pumps..20 degrees int and 34 total..should be pretty responsive,,   

[high perf mopar]

That's interesting to hear you're running manual secondaries, too. Like 440 said, I would have thought a progressive opening on the outer carbs would be better on the street letting you run just off the middle carb for low part-throttle.  Is yours like mine with all three carbs opening together or some kind of progressive linkage?  And also like 440, I'd appreciate any tuning tips you could share making these work on the street.

Thanks, Jim

your running on the center only on the street with the vacuum units also..the outers open only with rpm/vacuum at higher rpm..you can adj the outers at idle with the idle mixture screws but until a certain rpm your only opening with your foot the center,,sliders with stops to open these mech adj should be optimal..

[Road_Runner]

your running on the center only on the street with the vacuum units also..the outers open only with rpm/vacuum at higher rpm..you can adj the outers at idle with the idle mixture screws but until a certain rpm your only opening with your foot the center,,sliders with stops to open these mech adj should be optimal..

I ran an original vacuum set back in the 70's and they ran awesome at times and then wouldn't open the outer carbs at all other times.  Back then we actually put a small bolt & nut through the linkage that forced open the outer carbs basically bypassing the vacuum pots.  I'll have to check into the slider mod for the mechanical linkage you & Chryco are talking about, right now the linkage that came on this setup opens all three exactly the same with no delay.  Like I said, probably good for the track, possibly not so much for the street, definitely not for gas mileage.  This car always had kind of an off/on power curve anyway, kind of like a solid rocket booster!  Always wanted the car pointed in the right direction when you stomped on it.  Once I finally settle on the specifics for my engine, I'll probably start building mine sometime next year.  So if you're putting yours together sooner I'll look forward to hearing how your six pack experience goes.

Later, Jim

[high perf mopar]

I ran an original vacuum set back in the 70's and they ran awesome at times and then wouldn't open the outer carbs at all other times.  Back then we actually put a small bolt & nut through the linkage that forced open the outer carbs basically bypassing the vacuum pots.  I'll have to check into the slider mod for the mechanical linkage you & Chryco are talking about, right now the linkage that came on this setup opens all three exactly the same with no delay.  Like I said, probably good for the track, possibly not so much for the street, definitely not for gas mileage.  This car always had kind of an off/on power curve anyway, kind of like a solid rocket booster!  Always wanted the car pointed in the right direction when you stomped on it.  Once I finally settle on the specifics for my engine, I'll probably start building mine sometime next year.  So if you're putting yours together sooner I'll look forward to hearing how your six pack experience goes.

Later, Jim

mine is together and running..specs above..
the problem with making the vacuum carbs mech is there is no acc pumps on them,which will make your motor stumble/bog/backfire/no power without the gas shot from mech carbs..i did the same thing back and the motor was a turd,,when they all open as programmed off u went to the races..but with vacuum controlling your destinany its a crap shoot unless your on the drag strip where your wide open or wide shut.whats the make/model number on your setups?still have the oringinal boxes??according to holley/edelbrock/direct connection u/we need edelbrock linkage number 2472.straight from the catolog showing them as competiton series carbs..adj linkage..
the setup i just took off worked just like u mentioned,,when the outboards opened up at around 3000 hang on and make sure i was pointed straight,,puffin smoke off the rears when it shifted into second,half throttle,,but in my opoinion not the safest way to go..u could be cruising along in 1st at the car showwith some rpm's,,flexing your muscles,,then suddenly the out boards open!!!!not good.. kinda makes u wonder about companys like sixpackstogo.inc. that r no longer here modifiying stock vacuum setups for full mech with acc pumps,from stock carbs,welding in tubes to make it work???no good... i think that this is a VERY good well kept secret with these carbs..of course with original 6 pk cars it does not apply,,not as much fun either..nothing like crisp dead on throttle response..soon to be right here.   

[Chryco Psycho]

My stall converter is an 11" dual disc clutch !!