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    Mercruiser 5.0 twin engine high water pressure

    Hi I have twin 5.0 Mercruisers (one is 2002 and the other 2017) - Both have Hitek stainless steel manifolds (around 7 years old) Starboard engine has suddenly shown an increase in water pressure to over 35 psi at 3000 rpm - port is normal (3-4 at idle and 17 psi at 3000 rpm) No high temps...
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