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Six Pack Mechanical Carbs....what air cleaner? #2705969
10/11/19 03:57 PM
10/11/19 03:57 PM
Joined: Oct 2007
Posts: 576
New York
R/T1968R/T Offline OP
mopar
R/T1968R/T  Offline OP
mopar

Joined: Oct 2007
Posts: 576
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 04:08 PM
10/11/19 04:08 PM
Joined: Jan 2003
Posts: 9,034
Central,PA
62maxwgn Offline
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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 05:13 PM
10/11/19 05:13 PM
Joined: Jun 2003
Posts: 17,976
It's a dry heat
gtx6970 Offline
I Live Here
gtx6970  Offline
I Live Here

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Posts: 17,976
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 08:13 PM
10/11/19 08:13 PM
Joined: Mar 2007
Posts: 2,905
West Coast, USA
jbc426 Offline
master
jbc426  Offline
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Posts: 2,905
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 3.91'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 10:13 PM
10/11/19 10:13 PM
Joined: Jan 2003
Posts: 3,623
Moved to N.E. Tennessee
GomangoCuda Offline
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GomangoCuda  Offline
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Posts: 3,623
Moved to N.E. Tennessee
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 10:53 AM
10/12/19 10:53 AM
Joined: Feb 2014
Posts: 789
central il.
S
second 70 Offline
super stock
second 70  Offline
super stock
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Posts: 789
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 07:49 PM
10/12/19 07:49 PM
Joined: Jan 2006
Posts: 655
USA
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rftroy Offline
mopar
rftroy  Offline
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R

Joined: Jan 2006
Posts: 655
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 07:54 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, Aluminum Passon 5-speed, 3.55, B7 Blue
Re: Six Pack Mechanical Carbs....what air cleaner? [Re: R/T1968R/T] #2706366
10/13/19 10:00 AM
10/13/19 10:00 AM
Joined: Oct 2007
Posts: 576
New York
R/T1968R/T Offline OP
mopar
R/T1968R/T  Offline OP
mopar

Joined: Oct 2007
Posts: 576
New York
Thanks Guys!!

Re: Six Pack Mechanical Carbs....what air cleaner? [Re: GomangoCuda] #2706411
10/13/19 01:50 PM
10/13/19 01:50 PM
Joined: Mar 2007
Posts: 2,905
West Coast, USA
jbc426 Offline
master
jbc426  Offline
master

Joined: Mar 2007
Posts: 2,905
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 3.91's (closest thing to an automatic 5 speed going)
Re: Six Pack Mechanical Carbs....what air cleaner? [Re: jbc426] #2706424
10/13/19 02:23 PM
10/13/19 02:23 PM
Joined: Jan 2003
Posts: 9,208
Omaha Ne
T
TJP Offline
master
TJP  Offline
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T

Joined: Jan 2003
Posts: 9,208
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 03:43 PM.
Re: Six Pack Mechanical Carbs....what air cleaner? [Re: TJP] #2706471
10/13/19 06:22 PM
10/13/19 06:22 PM
Joined: Jan 2006
Posts: 655
USA
R
rftroy Offline
mopar
rftroy  Offline
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R

Joined: Jan 2006
Posts: 655
USA
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


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, Aluminum Passon 5-speed, 3.55, B7 Blue
Re: Six Pack Mechanical Carbs....what air cleaner? [Re: rftroy] #2706813
10/14/19 06:46 PM
10/14/19 06:46 PM
Joined: Jan 2003
Posts: 9,208
Omaha Ne
T
TJP Offline
master
TJP  Offline
master
T

Joined: Jan 2003
Posts: 9,208
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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