Not after quarter mile times,after the wow and cool factor at shows and cruise ins.
Would like to build a 93 octane pump gas 455 for this.
Any tips,advice or pointers?
thanks

 

That is a nice AU manifold
or appears that

keep thy compression DOWN if you want to
burn that

 

Would definitely be high on the cool factor. I have a 6 pack Super Bee and that 440 pulls hard. I would try and run at least 10-1 compression. Roller cam. Yahoo! Stall converter etc.

 

In addition to having the carburetors adjusted properly, be sure that the throttle body to manifold gaskets seal properly, and the "butterflies" in the end carburetors' throttle bodies seal completely when closed if you want a good idle.

 

Sweet. Following along Walt.

 

Cool setup, I have a question for you. Not familiar with Tri-power, obviously not an item you come across every day. The rear carb doesn't appear to have any linkage hook up, does it work off of vacuum? Honestly, even though Olds was the first to do it back in the 50's, you don't often see them. So, yes, it will be a great wow factor.

 

Welcome to the multi carb setup! I have some tips and advice before you get them tuned correctly. Be sure to lock all your hammers and give another person the key because at some time your going to want to hit them carbs, shave your head so your not scratching your skull so hard your hair is falling out. And last leave the aggression at the door don't bring it in the house and **** off others. Eventually after you get it all completely tuned make sure you document every adjustment with the carbs and timing cause one day you may have to rebuild and start all over again!
But when it all works it's very impressive.
Hope this helps.
Sean

 

The Front and Rear Carbs are connected by a linkage rod on the Passenger Side.

 

Thanks Brian,yes it is an AU.
I know you ended up with a fire,was it a bad fuel line fitting somewhere?
What do you mean by keeping the compression down? Is higher compression what caused your problem?
thanks

 

Thanks and yes I am hoping to be able to maximize the power available with 93 octane compression,roller cam would be nice,hoping for this also.

 

Thank you,I have read on these AU units some recommend using some sealer on the carb to manifold gaskets.
I'm going to have an expert in the field rebuild these so the end carbs butterflies should be set good.
thank you

 

Thanks Adam,but don't hold your breath,it will be somewhat time consuming,I work on a budget,just a hard working blue collar guy

 

Thank you
If you look at the first pic you see a long linkage rod between the two end carbs.
The way I understand it,2/3rd throttle or under your running on the center carb. After you get past the 2/3rd point the two outer carbs open up.

 

Thanks Sean,I'll lock up all the hammers

 

Thanks Randy

 

No doubt, I'm in the same boat. So cool, I would Love to find that
set-up in someone's garage or shop or basement or attic or...

 

I was very lucky and feel very fortunate to have been able to get this set up at a steal of a price which made the impossible an affordable reality for me.
Very thankful!

 

Thanks Randy I see it now that you pointed that out.

 

HI WALTER

The compression I ended up with requires 110 octane racing fuel to have engine run cool and not ping ,, This is only $6.45 per gallon locally

TO run #93 proof fuel you are going to want to stay around 10:1 ratio pistons
and not massively shave the heads or block deck. Or both , like Dan did on my engine

My engine started on fire when it back fired. The "cute" foam air cleaner elements did burn to a crisp , now have paper filters.
Luckily I was at home when it happened not on the side of the road Car-B-Q

 

In for the ride, always thought of doing this. It is unfair, only a couple of three years (including the J2) got multiple carbs.

 

I guess it's a good thing you are in Texas... I have several setups stashed away in my garage as spares for my 66 and possibly a conversion for my 67 W30 project... One of my setups has three 427 Holley carbs on it, not sure why I bought it other then it was very reasonably priced at $650...

 

those holleys actually bolt up to the olds intake??i have a corvette 3x2 400 h.p. oval port intake on my 66 ss chevelle,and i have really had no issues with it,actually increased my milage about 5 mpg over the 3310 holley i was running

 

The Feb 66 Service Guild bulletin had an article on setting up Tri-Carbs. Note also that you can move the stud on the center carb linkage so the secondaries begin to open at 30 degrees or 40 degrees.

 

ive run tripowers on GTOs for decades, they need maintenance and they work flawlessly..most of the time they have issues because of armature restos...

send the carbs off to a tripower guy...not just any carb guy a real tripower specialist, have them set up right and keep them maintained and driven often and the perform well..its the sitting for years that does stuff, and the new gas requires special gaskets, and fuel pumps...the gas today eats the gaskets and pump rubber up when it sits..

the carbs are nearly identical to the Pontiac stuff...

this is THE guy...ive used a few diff people and this guy has it together and knows what makes them work and stay reliable...and he, himself is reliable, you can ask him questions and hes not a dick...hes brought alot of parts to market and hes good for the hobby, hes not crazy high on price and service either...many many GTO people use him, he has great reviews.

http://www.pontiactripower.com/catalog

 

Thanks much for the info Brian!
I'll guess my compression will be around 10:1 as I want to run it on 93 octane.
Will paper filters contain a backfire flame and not catch fire? I have been looking at the foam filters.

 

Yes it is unfair!

 

Sounds like a great stash!

 

Thanks much for all the great info you have shared! Have learned much!

 

Thanks much for the recommendation.
I have heard about Mike's reputation and have talked to him a couple times concerning my set up.
Making plans to send them to him very soon

 

Not without using adapter plates...

 

It was all about buying them at the right time when prices and demand were low... For most, it's not believable, but I purchased my first spare set in 1983 for $125 which included a W30 Air Cleaner... I wish I had saved the advertisement that prompted me to go look at them... At the time, I wasn't even aware of the 66-W30 package availability and almost passed up the deal because the seller had said it only had one big air cleaner and not the three small ones which I was accustom to seeing...

 

In this day and age,that does sound unbelievable crazy.
It's a good thing you did follow up!

 

You should be "ok" with 93
I would get the non oxy NOT Ethanol blend fuel as it is easier on rubber parts and seems to store longer without going bad. You may want to use a lead additive and / or octane boost too.

I had not so good luck with the foam jobs
first the seams split where ends meet
and then the fire
i would guess paper would not burn as readily
have not been able to test as DMV plate tabs need to be updated to be code.

i purchased most of my "new" repro L69 parts from dad warpath. If you contact directly and buy more than one thing he will save you some $$$



all the best
b

 

HI W

I was out in the garage. raining here
My Au intake has #363 on the drivers side
what is cast there on yours## ???

Thanks

I am not going to use foam filters any longer
would you want the "screens"
I would donate them to your effort

lost triple20 email address
pm me with info if you want
b

 

My 64 Cutlass post was running a 425 Olds with a tri-power they were diamond polished and bigger jets they ran great. I had a 400 trans with 350 convertor and a W-27 3.91 posi it would run 12.50 at 110 all day long. The cam was a W-30 475 lift and 328 duration. My heads were shaved .060 just barely got the intake on. No pics but I do have one of car maybe later.

 

Thanks for the info Brian!

 

My AU has the same number cast on the driver side 363.
Would love to have the screens,anything to help save some money that I could spend elsewhere on my build.
Thank you very much!
Will send pm

 

Thanks much for the info Gerald,I have been trying to find out how much heads can be milled before the intake needs milled for proper fit between the intake and heads.
I don't want to have to mill the intake.

 

HI WALTER

Got your message RE the screens
I will need your mailing address to ship them to you
send me an email or pmessage as you like best

To run the tri carb on my 72 I had to use a v8 68 - 72 2 barrel cable to get wide open throttle and modified the cable mounting bracket. I think I bought these parts from scott aka oldspackrat


The painted bracket is the one that is on my car. The other is an example of a "before" heating , bending , pounding 2bbl factory unit

 

Don't worry about rebuilding the carbs. They really are simple and easy to get working together. There are several types of jets; correct ones aren't available today (70086xx) with the 60 degree tapered inlets. I have used quadrajet jets successfully. Use the HyGrade 385 Jiffy Kits if you can find them. Be sure to use a stiff gasket under the center carb with Permatex #1 per factory recommendation to help prevent vacuum leaks--or do something more aggressive like a metal spacer, or blocking some of the passage in the underside of the carb base.