I'm in need of a source for a vacuum advance for my dual point distributor 3438521. Mine is not holding vacuum and needs to be replaced. I can't find a part number for one of these anywhere and am at a loss. Also, should I be looking specifically for a 340 TA?

Thanks for you help.............

Find "Joesixpack" on here & PM him

just curious, why are you running the vacuum advance? My T/A seems to run better with the vacuum advance disconnected and blocked.

Ok I'll reach out. Thanks

To be honest I'm not sure if I will need it. I'm still learning the do's and don'ts for this project especially engine related. Are you running dual point distributor with points? I am but with a Pertronix setup.

I'd get a new one from Joesixpack & tune the dist with it. Initial/total(35)/springs/vac adv in order. It does have advantages such as better MPG, cleaner plugs. They ain't terribly expensive & later you can always cap it & see which way works the best for you. there was a recent post where the adv arm was interfering with the P plate so be aware of that but you already have the P system installed so I'm assuming you are good there just that the can wont hold vacuum. Just me I would highly suggest running it in a street app

I've pm'ed joesixpack so we'll see if he can help. I'm in the middle of restoring the distributor so I haven't installed Pertronix yet but will keep the adv arm issue in mind. Thanks for the the tips on tuning it though I'm not yet quite sure what it means. I have some research to do.

I agree. It will be street driven and I want it to run as best as it can while being as close as it was the day it left the factory.

After all this is my baby

sorry i have no dual point vacuum advances....340 dual point vacuum advance...tough to locate,not serviced in the aftermarket...makes it a chrysler/mopar only part
i did locate a complete dual point with vacuum advance...
http://www.rockauto.com

AUTOLINE Part # D1000 More Info Reman
Prestolite Type; Dual Point

this may be crazy but if a regular can will fit on the side of the dizzy but the dual point arm is different a person might cut/pin the arm from the old can on. It take some swiss watch fabbing skill but there is a fair amount of room in that area. But the can would be different on the outside & I believe you want originality showing so maybe that wouldn't be a good idea. Good luck with everything & holler in the future if you want dist setup help.

Thanks joesixpack. I sent a pm asking you what the difference in vac. advance of the same style/look and thought posting it here may help someone else. There are a couple on ebay that look identical to mine but are listed for other engines. Is there a difference? The spring maybe?

That is an idea and you're right it can be done but as you mentioned, I'd like to keep her as original as possible.

I will take you up on the dist setup