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  1. #1
    Member
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    Dec 2005
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    Compression Numbers???

    I just finished the powerhead rebuild on my 85 150 XP. When I checked the compression on the cylinders I am between 78-82. Does this not seem low for a 20 over complete rebuild? I guess the real test will be if it can get out of the water under a load. Thanks

  2. SC Club Moderator ChampioNman's Avatar
    Join Date
    May 2004
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    Crawfordville, FL/Lake Hartwell, SC
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    72,113
    #2

    Re: Compression Numbers??? (perfection)

    Comp numbers are consistent, gauges vary. You are within spec. Let'r rip.

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