Get a load of this cast FYB ACL - http://www.rexhp.com/airfilters.html

I don't know if it will fit under a BIRD hood but it emulates the later BIRD M-CODE (390 3X2) ACL.



Being a one piece, it will flow better than the three smaller ACL's that are more popular.

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The idle circuits will remain in the end carbs, but the screws will be turned in all the way.  With the cam I have, he said I may have to open them a bit to get a perfect idle.

... hmmph ...

Now that is a good idea to fine tune for a larger cam.

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Phil.  Email correspondence sent to you via Y-Blocks Forever Forum email system.  I've found this system to work for correspondence with some Forum members and not for others.
 
IF you don't receive my correspondence, consider contacting me at my email Internet address,  cncbrown2@gmail.com.  After receiving your email address, I'll resend my correspondence directly to you.

Thanks!  


NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York

Funny!  Charlie called me yesterday and we talked for a while.   Charlie is disassembling the three 94s I sent him and will be getting back to me with a cost to make them right.  The center carb will be a primary and the end carbs will be secondaries. The power valves and chokes will be removed from the end carbs and the holes plugged.  The idle circuits will remain in the end carbs, but the screws will be turned in all the way.  With the cam I have, he said I may have to open them a bit to get a perfect idle.  All new throttle shafts and butterflies.  He is also powder coating the bodies.  He has a number of other options.

I am also going to use his progressive linkage.  It's trick.  You can see this linkage on Youtube. He will also build my fuel lines. I am anxious to see how this setup runs on my car.  If it runs nearly as good as my current Holley, I'll be happy. 

It looks like I will have an Edelbrock 257 dual quad intake manifold for sale soon. 

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I was able to speak with Charlie of Vintage Speed on the phone today.   I asked him his opinion on running three primaries vs. one primary and two secondary carbs.   He said all factory tri-power setups used one primary and two secondary carbs as dumpers.  He said each tri-power needs to be modified and tuned for a specific combination and purpose.  He asked me to send him my carbs and he would provide me with his recommendations.  He asked a lot of specific questions about my car, my engine, my driving and my expectations.  I packaged them up today and sent them to his shop in Ft. Pierce. I'll post what he has to say.

The author recommends using three primary carbs and linking them with direct linkage. He says if you use one primary carb, the center carb may not be big enough and the throttle transition from one carb to three is difficult to tune.  I ran three 94s on a 312 years ago and I used three primaries.  It was somewhat difficult to get to idle properly, but I don't remember any issues when stomping on the throttle.  I did not use a Uni-Syn.  I will now. This question has come up before.  Should I run one primary and two secondaries or three primaries?  I would be interested in what linkage other tripower users are running.

The articles I have read said most tripower bad idle issues are caused by leaky throttle blades.  With new 94s now available, that could be avoided.

I think what the author is trying to get across is that setting up a set with modified end carbs and progressive linkage is more difficult and needs to be tuned on the particular engine as it would be almost impossible to build/calibrate it on the bench, box and send and hope the installer can work through it.. While he will build a three carb active system, he will not build a center w/ modified end carbs and progressive linkage due to the buyer not being able to tune properly and resultant headaches for him.

Think about it. You want to drive a car with three active accelerator pumps and chokes, hopefully trying to get then all to idle properly? You only need the center carb (larger CFM) to drive on the street. The two outer carb are dumpers (gas and air) that only come in at whatever RPM you set the linkage at. You eliminate the two outer power valves and upping the jetting until you have the correct operating mixture(s). No Choke, no idle circuits.

They would work in the same manner as a 4V, where the secondaries are only used for additional power.

This is one area scrub had it over a FORD of the period, both with their VETTE  8V and later VETTE 3X2. FORD had all (8V) come in together (w/ vacuum secondaries no less). This is fine for full race or hot street but not for regular street duty. I couldn't afford to keep gas in a setup like that, much less keep the plugs clean.

The articles I have read said most tripower bad idle issues are caused by leaky throttle blades.

Correct. The outer carbs need a thicker throttle plate (to seal the throttle opening to prevent a vacuum leak), a throttle shaft to fit them and a cast (not ALUM) throttle body so the throttle shaft will not wallow out the throttle bore shaft bushings on the base..

These carbs are available modified to save you the aggravation and worries.

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This is an interesting article.  The author recommends using three primary carbs and linking them with direct linkage. He says if you use one primary carb, the center carb may not be big enough and the throttle transition from one carb to three is difficult to tune.  I ran three 94s on a 312 years ago and I used three primaries.  It was somewhat difficult to get to idle properly, but I don't remember any issues when stomping on the throttle.  I did not use a Uni-Syn.  I will now. This question has come up before.  Should I run one primary and two secondaries or three primaries?  I would be interested in what linkage other tripower users are running.

The articles I have read said most tripower bad idle issues are caused by leaky throttle blades.  With new 94s now available, that could be avoided.

Maybe someone will find this info helpful regarding 3X2-

http://www.thecarburetorshop.com/Aftermarkettripowersetups.htm

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Attached the post to the wrong thread ...

The man has talent, no question about that.

I just don't understand the ACL. If he went to all that trouble, why not fab a real shaker? Guess he is trying to immolate a theme I never came across.

Anyone pay attention to the dueling SINGLE RESERVOIR MC's? He must be into road racing?

The radiator, could it be related to the 57 BIRD D/F Code?

EDIT - 

... immolate ...?

Where did I get that one from? I guess I need an update for my FUNK  & WAGNAL

The word is emulate dumba$$...

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