[MGR]

1969 2bb 350 2 speed auto. I am having a number of minor problems that have the leanings of a vacuum problem. My shop manual is of no value and Chiltons has vacuum schematics for only a dual action distributor using a 5-port thermostatic vacuum switch. Trouble is, my distributor is not dual acting and there is an adapter that plugs onto the 5-port switch which seals off 2 of the ports and converts it to a 3-port switch. I recall some years ago coming across the explanation for this set-up but for the life of me, I can no longer find any reference whatsoever to it. Help? Thanks for any insight.

 

[MGR]

I'm hoping if I ask the question differently, someone can help. Does anyone have a vacuum set-up on a 350 that is different from the apparent original that you could take a picture of? Getting desperate so thanks for any information.

 

[Terriblehondo]

Maybe if you post a picture of yours someone might be able to help by seeing if they have something different.

 

[MGR]

If I can figure out how to do it, I certainly will, thanks for the suggestion.

 

[MGR]

[sharedmedia=gallery:albums:5697] I think this does it.

 

[Terriblehondo]

I don't have that on my car. Sorry.

 

[MGR]

Thanks for checking. Is your vacuum advance on your distributor dual acting?

 

[Terriblehondo]

Mine has an HEI in it now. I wish I could remember if my 1st one had that on it but that was so long ago I cannot remember.

 

[Brian68]

I'm going to have to dig up my original intake, I remember seeing something like that on it.

 

[MGR]

Thanks Brian, anything you can contribute will be greatly appreciated.

 

[Brian68]

Okay, I've got that on my old intake. I have one vac line going to a metal line on the front of the carb. I have another line going to a T and one going yuk the back of the carb towards the bottom. The other lines are not connected to anything. I don't know if that helped, but I hope so

 

[MGR]

Thanks so much for checking, it helped a lot.