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Timed or Full Vacuum???

Discussion in 'The Garage' started by skink4president, Oct 19, 2005.

  1. skink4president

    skink4president Registered Member

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    On my '73 K5 I've used both. Don't have the original Q-jet so I'm not sure if it came stock with both or which was used. Edelbrock calls for "timed" vacuum on emmisions vehicles and full or "manifold" vacuum on non-emissions. The '73 came with emissions (not CA) but all has since been lost. Would I see a performance or mileage difference with one or the other? Right now I'm using timed and running an HEI and Edelbrock Performer square bore.

    Thanks!

    PS-I did a search of the forum using the above title but nothing came up. If we get some replies to this one maybe it'll provide a hit for others looking for an answer to this question.
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    You'll save gas at part throttle cruise in high gear if you use Ported vacuum .
     
  3. skink4president

    skink4president Registered Member

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    Ported is "timed", right?
     
  4. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Yes , but I don't like saying timed .
     
  5. Triaged

    Triaged 1/2 ton status

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    It shouldn't make for any performance or mileage difference. The only thing it will effect it idle. Mine idles better with it on full vacuum. Try both and use what works best.
     

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