1974 20ft Starcraft Ford 302 V-8 Overheats

Discussion in 'Propulsion' started by jwderque, Aug 21, 2007.

  1. jwderque
    Joined: Aug 2007
    Posts: 1
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    Location: Kentucky

    jwderque New Member

    I have a 1974 Starcraft 20 foot runabout with a 302 v-8 with a mercruiser 888. I don't know the first thing about boats. But I can run the boat at 2200 rpm and will stay about 150 degrees. I have pulled off the octopuss cooling system and replaced with a brand new 140 degree thermostat. There is water flow through all the hoses. I had it in the water and pulled the hoses off and the top set of hoses had exhaust fumes coming out. If I run it higher rpms for 3 or 4 minutes it gets HOT. Is there a problem with the risres and or the manifolds? I can run all day at 2000 rpms and it stays at 150 degrees. Please help with your opinions or fixes. They let the lake levels down here in a couple of weeks and I wanna take the kids out if I can. Thanks for your help! God Bless!
     
    jwderque, Aug 21, 2007
    #1
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