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general vacuum Q

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by 12B, Apr 1, 2003.

  1. 12B

    12B Registered Member

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    I'm in the process of trying to tune this 350 in a '70 K5. I hooked up a vacuum gauge between the carb and distributor and the gauge read <5 in at idle. Is this normal for these rigs? I've replaced all my vacuum lines, so I'm thinking the diaphram in the distributor vacuum advance is shot. Any insight? I've also just changed all the gaskets on the carb.
     
  2. Triaged

    Triaged 1/2 ton status

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    Your dist. advance must be hooked up to ported vacume. Try another line.
     
  3. BobK

    BobK 1/2 ton status

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    I think you should have at least 15-17 of vacume at idle.I take it it's a stock eng.
     
  4. Don

    Don 1/2 ton status

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    Doe's it have the stock Q-Jet carb? If so, what base gasket is under it? Alot of kit's come with an "open" base gasket that make's reading vacuum, a pain. Napa make's a base gasket that completely seperate's the bore's.
     

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