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    1990 Mercruiser 350 Magnum Alpha One tune for altitude?

    No idea unfortunately--I'll have to look and post some follow up pictures. Thanks for the suggestion!
  2. E

    1990 Mercruiser 350 Magnum Alpha One tune for altitude?

    Thanks for the suggestion! I do have a couple of 4-blade prop (steel vs current 3-blade stainless) that I can swap in. I think I'll try that---mostly concerned about pull/start vs top speed.
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    1990 Mercruiser 350 Magnum Alpha One tune for altitude?

    I have a 1990 Mercruiser 350 Magnum Alpha One (SN# OC757852) that runs very well. I'm located at 3000 feet above sea level where it normally operates and have been told that since its a carbureted engine that I'll want to tune it for a lake we're going to spend a week at in the near future...
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