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Six Pack Mechanical Carbs....what air cleaner? #2705969
10/11/19 04:57 PM
10/11/19 04:57 PM
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New York
R/T1968R/T Offline OP
super stock
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New York
Im looking at a set of mechanical carbs. It looks like the float adjusting nuts are offset on the mechanical carbs and will hit the stock air cleaner. Anyone have experience with them?

Re: Six Pack Mechanical Carbs....what air cleaner? [Re: R/T1968R/T] #2705972
10/11/19 05:08 PM
10/11/19 05:08 PM
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Blair County,PA
62maxwgn Offline
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They're offset but that's it,they are actually lower.If you compare,the center hung casting where the adjusting nut seats it is actually 1/4" higher than the side hung needle bowl.

Re: Six Pack Mechanical Carbs....what air cleaner? [Re: 62maxwgn] #2706003
10/11/19 06:13 PM
10/11/19 06:13 PM
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It's a dry heat
gtx6970 Offline
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It's a dry heat
Buddy of mine used to have a set on his Bird and I dont think any mods were done to the air cleaner

Re: Six Pack Mechanical Carbs....what air cleaner? [Re: R/T1968R/T] #2706046
10/11/19 09:13 PM
10/11/19 09:13 PM
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Posts: 3,275
West Coast, USA
jbc426 Offline
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West Coast, USA
I run a factory steel six pack Shaker hood base plate on my mechanical carbs. No fitment issues.


1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
Re: Six Pack Mechanical Carbs....what air cleaner? [Re: R/T1968R/T] #2706071
10/11/19 11:13 PM
10/11/19 11:13 PM
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Moved to N.E. Tennessee
GomangoCuda Offline
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I made 3/8" thick aluminum spacers that go between the carbs and the aircleaner base.
Without them the front fuel line interfered with the base. That was the standard 70-71 aircleaner.
I'm a little surprised to read that the shaker base clears. Anybody know if the AAR/TA base clears?
I know that an A12 base clears easy.


In theory, there is no difference between theory and practice. In practice, there is.
Re: Six Pack Mechanical Carbs....what air cleaner? [Re: R/T1968R/T] #2706164
10/12/19 11:53 AM
10/12/19 11:53 AM
Joined: Feb 2014
Posts: 1,695
central il.
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second 70 Offline
top fuel
second 70  Offline
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central il.
I didn't have to chance anything on the factory six pack cleaner on my 440 70 Cuda. Yeah poor old photo but it was 1974 and a race car. Lol

1A341EB7-7285-4330-A1EE-86F8DB77BA04.jpg
Re: Six Pack Mechanical Carbs....what air cleaner? [Re: GomangoCuda] #2706270
10/12/19 08:49 PM
10/12/19 08:49 PM
Joined: Jan 2006
Posts: 704
USA
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rftroy Offline
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USA
Originally Posted by GomangoCuda
I made 3/8" thick aluminum spacers that go between the carbs and the aircleaner base.
Without them the front fuel line interfered with the base. That was the standard 70-71 aircleaner.
I'm a little surprised to read that the shaker base clears. Anybody know if the AAR/TA base clears?
I know that an A12 base clears easy.


No, the TA base doesn’t clear without some changes.
As you said, the problem is from the front fuel line fitting. The carbs came from the factory with that straight out nipple, which runs in to the front of the air cleaner base on the TA.
The way I solved it, after many attempts, was using this 90° Holley fitting. I don’t care for these because if there’s weight on them caused by fuel line or vibration of the fuel line up and down it can cause them to loosen, unless you install them very carefully. Even with this fitting I had a double gasket between the carbs and the air cleaner.
The first picture, under the air cleaner, is with one gasket. The second picture is the two gaskets. You can see it’s very close, and it gets closer when you tighten down the carb stud wing nuts.
Robert

C29F9B99-CA19-484B-B422-F8DB4A13704B.jpeg71E91F01-FDC3-43B1-B5F8-6F654B2ECC81.jpeg9E24BA47-8EF7-4547-9840-63E2DCBF5ECA.jpeg
Last edited by rftroy; 10/12/19 08:54 PM.

AAR 4-speed 3.91, Tor-Red;
70 440 6 pack Roadrunner 4-speed 3.54, Plum Crazy;
68 Formula S conv 383 4-speed 3.23, Electric Blue;
69 Barracuda conv Slant 6 OD4 2.94, 71 B5 Blue;
78 Lil' Red Truck, Red;
70 Challenger S/E. 505 6 pack, Passon 5-speed, 3.55, B7 Blue
Re: Six Pack Mechanical Carbs....what air cleaner? [Re: R/T1968R/T] #2706366
10/13/19 11:00 AM
10/13/19 11:00 AM
Joined: Oct 2007
Posts: 733
New York
R/T1968R/T Offline OP
super stock
R/T1968R/T  Offline OP
super stock

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Posts: 733
New York
Thanks Guys!!

Re: Six Pack Mechanical Carbs....what air cleaner? [Re: GomangoCuda] #2706411
10/13/19 02:50 PM
10/13/19 02:50 PM
Joined: Mar 2007
Posts: 3,275
West Coast, USA
jbc426 Offline
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West Coast, USA
Originally Posted by GomangoCuda
I made 3/8" thick aluminum spacers that go between the carbs and the aircleaner base.
Without them the front fuel line interfered with the base. That was the standard 70-71 aircleaner
.
I'm a little surprised to read that the shaker base clears.


Anybody know if the AAR/TA base clears?
I know that an A12 base clears easy.


I run individual -6AN fuel lines with banjo fittings to each carb. A straight out fuel line would hit on the front carb.


1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
Re: Six Pack Mechanical Carbs....what air cleaner? [Re: jbc426] #2706424
10/13/19 03:23 PM
10/13/19 03:23 PM
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Posts: 15,193
Omaha Ne
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TJP Offline
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TJP  Offline
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Posts: 15,193
Omaha Ne
any chance of changing to the center pivot bowls ??? I run the mechanicals on my 38 but I machined and air cleaner for it .

2015-09-13 2015-10-07 001 002.JPG
Last edited by TJP; 10/13/19 04:43 PM.
Re: Six Pack Mechanical Carbs....what air cleaner? [Re: TJP] #2706471
10/13/19 07:22 PM
10/13/19 07:22 PM
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Posts: 704
USA
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rftroy Offline
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Originally Posted by TJP
any chance of changing to the center pivot bowls ??? I run the mechanicals on my 38 but I machined and air cleaner for it .


No, you can’t use the center pivot bowls. The problem is the rear carburetor. The center pivot bowl is longer than the side pivot bowl, and when you put on the required metering block for the rear carb, it will interfere with the center carburetor.
From the pictures I’ve taken, I can almost guarantee also that a center pivot bowl on the front carburetor would hit the air cleaner and not let allow it to seat, also due to the addition of the metering block, at least on the AAR and T/A air cleaner
Robert

PS. I updated this on 6/7/2021 in case someone is doing research and comes across this post. I think I made it clearer.
RT

Last edited by rftroy; 06/07/21 03:41 PM.

AAR 4-speed 3.91, Tor-Red;
70 440 6 pack Roadrunner 4-speed 3.54, Plum Crazy;
68 Formula S conv 383 4-speed 3.23, Electric Blue;
69 Barracuda conv Slant 6 OD4 2.94, 71 B5 Blue;
78 Lil' Red Truck, Red;
70 Challenger S/E. 505 6 pack, Passon 5-speed, 3.55, B7 Blue
Re: Six Pack Mechanical Carbs....what air cleaner? [Re: rftroy] #2706813
10/14/19 07:46 PM
10/14/19 07:46 PM
Joined: Jan 2003
Posts: 15,193
Omaha Ne
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TJP Offline
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TJP  Offline
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Joined: Jan 2003
Posts: 15,193
Omaha Ne
Originally Posted by rftroy
Originally Posted by TJP
any chance of changing to the center pivot bowls ??? I run the mechanicals on my 38 but I machined and air cleaner for it .


No, you can’t use the center pivot bowls. The problem is the rear carburetor. The center pivot bowl is longer than the side pivot bowl, and when you put on the required metering block for the rear carb, it will interfere with the center carburetor.
From the pictures I’ve taken, I can almost guarantee also that a center pivot bowl on the front carburetor would hit the air cleaner and not let allow it to seat, at least on the AAR and T/A air cleaner
Robert


thanks, Something I always wondered about beer







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