Was thinking of adding a vacuum advance canister

Discussion in 'Small Block Tech' started by Mark Demko, Nov 6, 2018.

  1. Mark Demko

    Mark Demko Well-Known Member

    Im thinking of adding a vacuum advance canister to my MSD 8548 Pro Billet distributor IF its even possible.
    Is it worth it during highway driving or am I just setting myself up for issues?
    I've been running this distributor for years and haven't had any issues NOT using vacuum advance.
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    AFAIK, it isn’t possible. Call MSD to confirm. On a street driven car, it’s a plus for sure.
  3. 72gs4spd

    72gs4spd Well-Known Member

    I agree with Larry. I contacted MSD and they said it wouldn't work. I found a brand new Mallory on ebay and bought it instead.
  4. Stevem

    Stevem Well-Known Member

    If your driving it on the street no less highway miles I would go as far as spending the money to get a Dizzy in the motor that has vacuum advance, maybe you could even borrow one!?

    You don't realize how much unburned fuel is wearing out your cylinder walls and getting into your oil during part throttle and cruse times!

    Even if your only able to add in just 8 degrees of advance it's worth it cost wise!
    If you need real world proof then find a nice long flat stretch of road that you can do 55 mph on and bring your timing light along.
    Drive that stretch of road and the stop and add in 6 to 8 degrees more base timing and make the drive again and see what you think!
    Last edited: Nov 9, 2018 at 5:32 AM

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