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    yamaha 3.0 l4 blew head gasket help!

    I have some updated information. My retired boat mechanic that worked on this boat several times told me after I sent a video of it running that I may not have a blown head gasket. I made a video and because some mechanic friends think it might be bottom end noise I checked with a few more of...
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    yamaha 3.0 l4 blew head gasket help!

    Will parts for GM from Auto Zone work like they did in my 3.0 6 cyl 165 hp motor on my runabout. They looked up a 250 inline 6 truck motor for the lifters & the pushrods Thanks
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    yamaha 3.0 l4 blew head gasket help!

    now im really confused because another post where a guy wanted to swap yam parts for mercruiser they said he needed to swap all the wiring ,lower unit ,and much more . im just wanting to basically do a head gasket job or head swap to get my boat running again . i want to use my block and all...
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    yamaha 3.0 l4 blew head gasket help!

    Bondo sorry to go on lol but there is a local boat guy I've known for 40 years that has a few 3.0 inline 4 cyl motors i think 1 is a Volvo and one is a mercruiser , he has 5 or 6 manifolds but the ports are different than my head . your saying that doesn't matter so could i bolt one of the...
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    yamaha 3.0 l4 blew head gasket help!

    thanks for reply the ports on the head that mercruiser offers reman heads there are 8 ports and on my yam there are only 6 . i remember the manifold we bought 1/2 of the port would have been blocked if we bolted it to the head .wouldnt that cause flow issues , loss of power or cooling...
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    yamaha 3.0 l4 blew head gasket help!

    Ive got a 1993 Harris Flotebote with this engine sterndrive combo and i have redone most of the boat with new, floors,carpet,seats etc so i don't want to dump it or trash it . i have had the lower unit rebuilt and has new bellows also. pulling a tube with grandkids must have been too much for...
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