89 mercruiser 305 v8 running hot please help

nate6982

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May 28, 2012
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ok im new at this but i have a mercruiser 305 seems to be a chevy 305 i just bought the boat and its running hot i have tried it in the lake and in the yard at idle it has very little water flow at higher rpm it seems to flow better im a automotive mechanic and have been for about 15 years so i have applied my knowledge to the issue i have done all i can to figure it out i have change the impeller in the foot no change i have changed head gaskets the exhaust elbows are little rusty i have very little water coming from exhaust prop area it seems to have exhaust blowing into the cooling system in the automotive field this would most likely be a head gasket or cracked block if you have any ideas please respond thanks nate
 
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