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Vacuum Advance Canister Diaphragm Ruptured... twice

Electrical and Ignition

  1. Jimmmmmay

    Jimmmmmay Member

    Likes Received:
    Jun 15, 2019
    Cleveland, Ohio
    Hey everyone. I've got a Proform 66990 distributor in my 408 stroker motor that I bought new back in November from Summit Racing. Back in April, I noticed the vacuum advance canister wasn't holding vacuum anymore. I called up Summit and they worked with Proform to send me a new canister (really happy with their customer service on this, btw). Got the new one and put it on, set the timing, etc. It was working great for about 100 miles, but it ruptured again. I wasn't beating on the car hard or anything and I'm going to contact them again about sending me out another canister, but what do you guys think? Has anyone heard of this happening so frequently? I'd like to think it's a fluke and just a part quality issue, but having it happen twice in such a short period of time makes me wonder.


  2. halifaxhop

    halifaxhop Well-Known Member

    Likes Received:
    Dec 14, 2017
    Unusual for sure. Bad batch of parts?
    • Agree Agree x 1