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    87 5.7 Omc exhaust over heat

    Looking for some help here with an overheat. Marine mechanic who is stumped. My 1987 3255 Avanti. Port motor runs at 150-160, risers are at 200 degrees at 3000 Rpm where stbd riser is at 110 degrees. Eventually when running it will stumble run like crap and shut down, acts almost like a hydro...
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