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  1. #1
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    Inline 6 Question

    I have a 1978 90hp mercury and a 1978 115hp mercury. What is the difference? Just carbs?

  2. #2
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    I think the ports in the 90 are real small.......the 115s are small but the 90s........They run smooth.

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  4. #3
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    I don't think the 90 has power port pistons and cyl porting to match . hf ...

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