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454 Mag Leak/Compression numbers

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Old 06-22-2016, 06:08 PM
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Default 454 Mag Leak/Compression numbers

1998 Merc 454 Mag 296 hours where should the numbers be on compression and leak down test? Boat is a 25' Baja Outlaw if that matters.
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Old 06-22-2016, 07:49 PM
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I thought they were supposed to be 150.
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Old 06-23-2016, 09:29 AM
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You should be in the 145 to 155 range, leakdown should be 30% or less
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