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Altitude Ajustment

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by hairycowman, Dec 27, 2001.

  1. hairycowman

    hairycowman Newbie

    Joined:
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    Location:
    Crawford, CO
    My sea-level born girl now rides at 6600'. Any ideas on where to start timing for this altitude? I have a 350 with modest edelbrock rv cam. Already rejetted carb.(Q-jet)

    Living in up in Cocker country! Stock '71 K5 "Green Machine"
     
  2. Steve_Chin

    Steve_Chin 1/2 ton status

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    Location:
    Foster City, CA, USA
    Most guys find little need to change their ignition timing with altitude. With a mild 350 and iron heads, I'd put a curve in there that goes to 36-38 degrees total at 2400-2600 RPM, starting the curve at about 1000 RPM.
     
  3. 69K10

    69K10 Registered Member

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    Location:
    Florissant Colorado
    I live at 8,500 feet and I time mine the same as at sea level. Its the jets that count and It can take a while to get that just right.

    69K10, 350,4spd, Pwr Brakes, Pwr Steering
     

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