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  1. #1

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    Ultra 150 stock compression?

    Hey guys just wondering what a new stock boat should have for compression. I just did a test and had 120 even across all three and wondering if the head is stock or milled.


  2. #2
    Stock 110-120

  3. #3
    manual says 98-155 im pretty sure

  4. #4
    Spooling's Avatar
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    ^ 155 psi ^ I'd like to see that on a stock set of heads.

    Possible if you are somewhere like 3,000 feet below sea-level maybe?

    Heck - I think with those 93 octane domes installed - I was obtaining only ~ 130 psi (cold)

  5. #5
    steve45's Avatar
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    The higher the elevation, the lower the compression pressure.

  6. #6

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    Thanks guys! So I'm looking good at 120

  7. #7

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