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  1. R

    what prop

    1988.. 21 ft seaswirl omc cobra with 5.0 Chevrolet with sea level gears in out drive but now the boat is in salt lake city Utah elevattion 5000 ft
  2. R

    1988 omc out drive in 21 ft. seaswirl high altitude gear change

    I have sea level gears and need no how to install high altitude gears in top of out drive. Boat is sluggish
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