What's Wrong With These Triple Holley Carbs? Fixing A Common Problem On Our 1970 Plymouth Roadrunner 

Look for this beauty in the barn find section at MCACN in Chicago November 18th and 19th! Hope to see everybody there!

There’s a reason why when the cars were about 10 years old, so many of those six barrel cars wound up wth four barrels installed, and the cars had that retained theirs, it’s likely because they were never driven. So I feel for all those friends of mine that have had to hunt down all the pieces they needed to restore their cars, only to discover a world of driveability issues and diagnostic nightmares now torment them. But I do absolutely love them.

70" Road Runner or GTX my absolute favorite Mopar of all time..that front grill design..❤ yours is a Beauty!!

Oh neat, and I desperately want it.... But I want Every classic mopar. But road runners are spicy... And 2 door coronet's

I am also not a Holley carb fan, and 3 Holleys is just 3 times the pain. I like Carters and Edelbrocks, and the Thermoquad is my favorite. I have a mildy modded 318, and first I had a 600 Holley, and I just could never get it to work right. Then one day I attempted to drive home from work, and there was gas all over the top of the engine. Not a fun time. Then, someone said "hey, I'll sell you a Thermoquad off a 77 Cordoba with a 400 for $20". SOLD! I put that T-Quad on without doing anything to it, other than adjusting the idle mixture screws and it worked like magic. I had to put an adaptor on it for the spread-bore to fit a square-bore manifold, which only seemed to help it because it raised the carb up about an inch.

Awesome car. The slot mags and proper tires make it. Glad to see an update. Got to remember that who knows how many people have messed with those carburetors

Blown power valve. Install one of those anti-backfire check valves in the power valve vacuum passage. Also, don't even hook up the outer carbs until you have it running the way you want it on the center carb. :)

I watch a lot of channels and comment ❤ is what I get back from every one except for you Jamie. You actually answer thanks.

I love three two barrels as long as you remove them and put a nice intake and brand new ATM carburetor or an old school predator the square boxes that are super cool that highly nobody ever heard of those carburetors kick ass cool Roadrunner have a great day I found a can of WD-40 in my garage that's so old it's wd30 now

When I was a teen in the 80's I had a 72 Rallye Charger 440 auto as my daily driver, original 440 magnum car. I had an older friend of mine who had a 1970 Road Runner that was a factory 440 6 pack, 4 speed, super track pack 4.10 gear dana car. The Road Runner was at the time a non runner and super rusty. The 6 pack intake and carbs were in the trunk. He lent them to me to try them out and I fell in love with the 6 pack setup. I rebuilt the carbs and put the cast iron intake (weighs a ton) and carbs on my 440 Charger. Even though the system looks complicated with the 3 carbs, it is extremely simple to work on. The center carb does all the work, in effect you have a 440 2 barrel engine until you punch it and the 2 outer carbs open by vacuum. The 2 outer carbs are super simple, they have no idle circuits and no metering blocks (they have internal metering plates). As long as the outer carbs are clean, you have a good needle and seat in them, and the vacuum diaphragms are good, you are good to go. Car runs 99% of the time on the center Holley 2 bbl that is super easy to service, only time the outer carbs work is when you floor it. The linkage on the drivers side that ties all 3 carbs together was also easy to adjust, and once adjusted by the instructions on the service manual you never need to touch it again.

Oooooo roadrunner n a corn dawg a great friday afternoon Shes a cool looking car

I've never been much af a Holley fan, my favorite carb has always been the Carter AVS. My 69 corvette is a L68 427 tri power car, sadly its missing the setup and has a big block quadrajet now like came on the L36 427. I'm planning on finding and replacing the tri power setup to replace it and put it back original but its going to be really costly. That car looks awesome with the old school slots!👍

What a rig that ride is! Definitely like the mags on it. Sweet!

Great video Jamie! Got to tell you that back in the day when these 6packs were new, they still were horrible to try to adjust them. I had a friend with a 340 six pack that never ran right. You did great especially considering you can't get the right parts anymore, it sounded pretty good!

Looks a lot better with those tires and rims

Nice to have some "V-code" content....nice color too.

Had a ongoing argument with a buddy years ago. Me Carter, he Holly 'cause muhjustable. I always hated all major gaskets trying to contain megapuddles of gas. Give me rods, pistons and plungers over diaphragms, plates and power valves any time. As for 6 barrels or 8? 8 if theyre contained within Carter AVS's. But alas 6 barrel, 6 pack or even tri-power (gag) looks way cool.

Another fine video. Informative and entertaining. I've had several holleys over the years. Haven't owned one since 1993. I never had any issues with them. Keep up the good work!

Ooh my, slot wheels and flames for the win! Too cool. 🇺🇸

Such a sweet Plymouth

Slot mags for the win!!

I would take it looks awsome

I love that beast! It just needs brought up to par

Holley carbs do work, I've seen them. Both 2bbl and 4bbl I think it gets a bit dicey with vacuum operated secondaries, though. I'm a big fan of the thermoquad and quadrajet.

Thanks Jamie

My brother had a Holley on his Charger and he spent many episodes under the bonnet (hood) with that thing. I actually liked both sets of wheels on the Roadrunner. Great show, Jamie.

Good video. I just rebuilt my 6 barrel set up for my 440. There are idle mixture screws in the base of the outboard carbs. They are filled in with soft metal. When the metal is removed you can adjust the idle on the outboards. Use a solvent to get them unstuck. I used longer needles on the rear carb to make it easier to adjust. Mine run smooth as a 484 cam will allow😂. Good luck.

You need the special holley tool. BFH. I am with you,never had any luck with them. Dome light working makes it all good.

Super Amazing Me is a Holley hater, but an insane six pack lover. Here's what has worked for me in the past. Replace the power valve with the Holley screw-in block-off piece if they still sell them. Usually, I have to install main jets 2-3 sizes larger. Note that in my cases, the engines all had slightly larger cams with 471-484 lift. The last six pack I built consisted of 3 Weber IDF40 carbs, on a modified Offenhauser intake. The entire system cost me around $1000. The 3 Webers were brand new Chinese copies at $71 a piece off of eBay. I figured that if it didn't work, I didn't lose a ton of money. Well, it runs way better than a Mopar Holley system on top of a 383 with an Erson 462 lift cam, since I finished it in 2018. I had to do a lot of research and trial and error, because the Weber carbs have a set of wet jets, and a set of dry jets, and 6 mixture screws. They are basically racing carbs with a lot of adjustability. They start mixing air and fuel inside a tube inside the carb. Very cool! Nobody thought that I could make it work, but I did! That was super amazing! I won a plaque for it in my '73 Charger with a Tremec TKO 5-speed. The first burn-out with it scared the crap out of me, but now I use it to scare my growing list of friends. Hah!

OMG that makes me miss my ‘70 R/R clone (belvedere), it really was a great car

You got all the right toys to play with. Can I come over to play?

@7:43. 😂👍😉

Lol the mud flaps sold me on this one. Ima call summit. Thats sexy as socks on a rooster lol

My thoughts have always been use a Holley for Performance and tuneability; use an Edelbrock for daily drivers and reliability. I've found on all my junk I've had to richen everything up because recently here in Canuckistan; they've switched to ethanol in ALL fuels now. Even the Premium has alcohol in it now. This means less fuel concentration and less MPG for sure. But it's that lack of pure gasoline I believe is what's messing up our idle mixtures. Instead of 100% gasoline; we're now getting 90% gasoline. So, we must make mixtures richer to compensate. Not sure what fuel y'all can get in Washingtown.... but I'd imagine you're in the same canoe.

The wheels made me instantly want the car

My 70 440-6 was a pita in the same wane ways 40 years ago. $o fun tho.

I’ve never had a 6 pack car , but I’m Holley carb all the way

I like the spec of that car. Id buff the flames off but otherwise its perfect!

Very few problems in this world that can't at least be improved with a hot torch and a heavy hammer :⁠-⁠)

I've always wondered if it is possible to do that with 3 Carter 2bbl carbs.

6pack. There is tricks to them. Proper tech skills knowledge!!! Which I know past by heart! 1 440 6-pack I built current #3 in world 70cuda B/SA

Reminds me of my Challenger T/A. It never ran right with the proper fuel level in the center carb. I took it to a shop and they lowered it. I thought huh?

Well ,,,, at least they leaked on the outside. My holly leaked on the inside just dumping gas down the inside and I wiped out a cam and lifters . Thanks man.

Ooooo plymouth

Pop quiz...Why are there so many aftermarket parts available for Holley carburetors? Because they need them.😂

The biggest problem with Holley carbs is they have waaaay too many "soft parts" or rubber components that do not last very long especially with today's fuel. Pretty much if you have a Holley carb that sits for any longer than a few months, then be prepared for leaking gaskets/accelerator pumps/power valves/ seals. I do like Holley's for a high performance "racing" applications but for a street car or daily driver I prefer quadrajets(I'm into mainly GM cars) and Edelbrocks because they can sit for many many years and will usually work perfectly with almost no issues besides maybe the accelerator pump to stop working but is a very simple and cheap fix. Also the cost of Holley products and parts have gotten crazy expensive over the past few years and their quality really seems to be dropping off.

Wow that sounds pretty crappy, cranky and awesome! My needle and seat had crap in it. Had a bad power valve also. I was in automotive class with my 69 Charger when my instructor was making adjustments to the four barrel, had me pump the gas a few times. Didn't start. He made the correction and had me try to start it again...fuel in the bowls, sounded like a cannon went off and blew the donuts. People were running from across the parking lot - might have been a terrorist attack but no, just blew the donuts. I feel so weird...my six pack/six barrel runs like a raped ape.

Bit of an odd question, but would you happen to know how interchangeable are the column shifters on 1970 chrysler cars? Seeing a Charger dashboard in a Roadrunner is giving me some hope of interchangeability between the models.

Leaking throttle shafts will cause rough idle, also you need yo sync the carbs after all the vacuum leaks are fixed

The original 1969 and early 1970 6 barrel carbs had some defect that was fixed in late 1970 and 1971 model. There were replacement fixes for them, but not everybody got them. I forget the exact problem, but I think it was some sort of internal leakage.

Tells us about that white 4dr in the garage? I like 4 door cars.

What‘a the differece between Roadrunner und Satellite?

Nice nice nice

talk all the shit you want - I still LOVE that car!!

Hey Jamie, do you want some cheese with that wine? I think Holly carburetors are awesome and I don’t even have a car and don’t even drive but I like Hollys so again do you want some cheese with that wine?

If tech advances enough for home 3D printing aluminum intakes, I want to make a Six Pack setup using Carter BBDs... A 340 Six Pack was part of my original goal for my Challenger; I am less sure now but I have many of the parts NIB so its still possible. There used to be a Six Pack guru on one of the old Mopar boards who had a lot of suggestions on getting them running very well. Going to have to dig out the old Apple 2GS and see if all those notes are still there. I think there's a dedicated book for the Six Pack carbs also but I never got to the point of being able to try anything. I would love to drive one someday!

For sale?

If you want, I'll take one for the team and trade you a Carter BBS for that three carb monstrosity. 😂

Personally, I prefer the six-packs that sit in big glass freezers at the corner shop.

I wonder if anyone has been silly enough yet to try 3 of the Sniper 2300 FI systems on a 6 barrel car? I believe FiTech also makes a 2 barrel throttle body, I'm sure someone could come up with some tuning software for such a set up. I despise aftermarket EFI systems, just more curious than anything. That being said, to Google!

Now i remember why i call them six pacs butcause you need a 6 pack to tune them. When you think you nailed it start it again and repeat. Everyone i have had sucked to keep tuned. But when they work right its party all the time and all night long. Last one i did was a T/A chally. I came up with new way to use the word fuck before i was done. Power values do not live forever even if they are new. Just sayin. Cant wait for the 70 charger tune.

Its the right needle, but needs a new o-ring. It leaks. 😉

I know you must have heard this before, but this car will do soooo much better with a good 800 com AFB, yes the Carter carb, jet it, set it and forget it! I went through my holley stage, had 4 of them before I learned my lesson, and the one 750 cfm AFB I used to drive home with beat all 4 of the holleys I had with me at the time, I was at LACR, now closed, and that AFB beat all 4 of those other carbs, better ET, better MPH along with improved 60 ft times. Sell that Restomod pile of leakers, get a good hi rise dual plane adorn with an 800 AFB and never look back. You would probably make a nice profit from the sale of that problematic 6 pack and have alot left over after getting your new manifold and carb!!

HaHaHa that stance .

There is nothing wrong with hoarding parts I probably have 10 14 mm wrenches. And what year did they start installing fan shrouds. I’ve come really close to losing a finger. 👍😂

☕

3:20 Wow. Carbs. Lots n lots of carbs. Wow. Again I say Carbs. Wow. So .......many.......Carbs......Wow. Flames.....cool.

FYI DDG giys. Just for Mopar Life One help hint 3 carbs in row. 6 bbls. Not same throttle excel p valve set tune... Is engine OEM mechanical fuel pump 70 H.P. 6-psck cam n valve train ??

You have a leaking power valve

Did you give much for it

needs large hooker headers and bigger exhaust pipes

I hate Holleys too. Worthless crap... You'll never see a Carter (Or Edelbrock) with a blown power valve...

Two carbs too many.

Wrong fan very wrong fan!!

Put a fuel injection system on it and drive it everyday

Try learning how to do it right, and show the correct procedure. You don't like Holley carbs because You don't know what You are doing.

I still have an original set of these carbs that I took apart to have cleaned and re-plated afterwhich I rebuilt them. I already had a six pack set up on my car and was going to use them for another project that never materialized. If you know what you're doing this setup works great. The biggest problem this setup had was people working on them that didn't know how they worked messing them up. If you had room under the hood and put spacers under these carbs the response was dramatic.