76 vette..what is this?

pete44 · 2007-12-19 03:03:40

what is this and where can I get one?....Thanks,Petehttp://s15.photobucket.com/albums/a373/dmcpeters44/?action=view&current=EnginePicsVacuum006.jpg

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Dec 18, 2007 | 10:03 PM

pete44

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76 vette..what is this?

what is this and where can I get one?....Thanks,Pete

Dec 18, 2007 | 10:21 PM

vetteguy75

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From: Shreveport LA

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That's your manifold vacuum port and I believe it's connected to the automatic transmission vacuum servo.

Dec 19, 2007 | 06:52 AM

Jim Shea

Le Mans Master

Joined: Jul 2000

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From: Saginaw Michigan

My 1976 AIM indicates that there is a short piece of rubber and then a pipe that goes down to the automatic transmission from the top of that fitting. It also indicates the M38 and M40 transmission options. Both are GM codes for 3 speed automatics. But I don't see the M38 listed in the Corvette Black Book. M40 is the Turbohydramatic.

JIML82

Dec 19, 2007 | 07:27 AM

donnd

Racer

Joined: Dec 2007

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From: Kingston Ontario

Just a little note ; these come with 1 ,2 or 3 ports depending on your vacuum set up.
Question ;does anyone know where I cam get a hard copy AIM Thanks

Dec 19, 2007 | 07:49 AM

markdtn

Le Mans Master

Joined: Aug 2003

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From: Chattanooga TN

The vacuum trees are available from Paragon, Dr Rebuild, and other catalogs.

Dec 19, 2007 | 07:51 AM

Jud Chapin

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Joined: Sep 2001

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From: Wellington, FL

St. Jude Donor '11 thru '25

Quote:

Originally Posted by donnd

Just a little note ; these come with 1 ,2 or 3 ports depending on your vacuum set up.
Question ;does anyone know where I cam get a hard copy AIM Thanks

Most of the Vette vendors sell them along with Ebay being a source. Be careful, though, as many of these manuals have been copied over and over and over again rendering many pages difficult to read. You might also try to find one at a Vette flea market as there you will be able to see what you are getting.

Dec 19, 2007 | 09:31 AM

SIXFOOTER

Le Mans Master

Joined: Jan 2006

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From: Boca Raton Florida

Ecklers has a couple of the vac ports
http://www.ecklers.com/product.asp?p...6&dept_id=1273
They also have the AIM, but like the guys said, they are a copy of a copy of a copy

Dec 19, 2007 | 10:19 AM

dgruenke

Drifting

Joined: Apr 2002

Posts: 1,716

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From: New Baden Illinois

Quote:

Originally Posted by vetteguy75

That's your manifold vacuum port and I believe it's connected to the automatic transmission vacuum servo.

There should be a metal line that comes up from the transmission. The line slides right into the top of the vacuum hose.

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Dec 19, 2007 | 06:18 PM

pete44

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http://s15.photobucket.com/albums/a3...sVacuum007.jpg

Another pic and angle...I can clearly see the line to tranny (rubber hose to metal)..but...if you notice the top of manifold vacuum port it is "capped off"...could this capped off port went to something else at one time and what?......Thanks,Pete

Dec 19, 2007 | 08:31 PM

#10

7T1vette

Team Owner

Joined: Jan 2006

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From: Crossville TN

I think that's where the metal tubing going to the tranny vacuum modulator gets plugged in. I don't see that line in the photo.

Dec 19, 2007 | 09:03 PM

#11

donnd

Racer

Joined: Dec 2007

Posts: 404

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From: Kingston Ontario

Looks to me like an after thought modification .on my 73 I have a 2 port, 1 port to auto tranny the other to my headlight vac system. Manual trannies don't have modulator valves so they don't use vacuum. These puppies aren't that costly (around $30.00 or less) so........
Hope this helps

Dec 19, 2007 | 11:48 PM

#12

76 VETTE

Melting Slicks

Joined: Oct 2005

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From: upstate N.Y.

Is that tube supposed to be hooked up to the rear top of the carb? On my 76 there is nothing there.Mine is automatic and has trans. and headlight vac.lines to a 2 port manifold tube.

Dec 20, 2007 | 11:33 AM

#13

redman76

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Joined: May 2006

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From: Nashville TN

St. Jude Donor '09

Quote:

Originally Posted by SIXFOOTER

Ecklers has a couple of the vac ports
http://www.ecklers.com/product.asp?p...6&dept_id=1273
They also have the AIM, but like the guys said, they are a copy of a copy of a copy

Thanks SIXFOOTER, I was looking for something exactly like this so I could connect my distributor vacuum can to manifold vacuum instead of carb port.

Dec 20, 2007 | 12:25 PM

#14

Patrick73

Burning Brakes

Joined: Aug 2004

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From: Tyler Texas

Quote:

Originally Posted by donnd

Just a little note ; these come with 1 ,2 or 3 ports depending on your vacuum set up.

Most 4 speed cars came with an intake manifold vacuum fitting that had only one port. You can install a a fitting that has an extra port which can then be used for a quick vacuum gauge hookup or an additional source of full vacuum (not ported) if needed for other purposes.

Dec 20, 2007 | 12:30 PM

#15

Patrick73

Burning Brakes

Joined: Aug 2004

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From: Tyler Texas

Quote:

Originally Posted by donnd

Question ;does anyone know where I cam get a hard copy AIM Thanks

http://www.parts123.com/parts123/yb....Z5Z5Z50000050G

All the major vendors carry the AIM. It is C3 year specific.

Dec 20, 2007 | 07:27 PM

#16

Jeffery73

Burning Brakes

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From: Port Clinton Ohio

St. Jude Donor '08-'09-'10-'11-'12-'13

Mine has lines to the transmission and headlight system as stated above.

Dec 22, 2007 | 12:52 AM

#17

SEVNT6

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From: Omaha NE

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Quote:

Originally Posted by pete44

The side port went to the tranny & the top port should go to your headlight vac lines...

Dec 22, 2007 | 11:34 AM

#18

76 VETTE

Melting Slicks

Joined: Oct 2005

Posts: 2,114

Likes: 0

From: upstate N.Y.

Quote:

Originally Posted by SEVNT6

The side port went to the tranny & the top port should go to your headlight vac lines...

On my 76 the top port is the tran. and the side port is headlights.
The tran. line comes up in a pre bent angle with a small piece of tubing and slides over the top port.

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