Need a jet boat/ 454 engine specialist in central CA
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Need a jet boat/ 454 engine specialist in central CA

  1. #1
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    Default Need a jet boat/ 454 engine specialist in central CA

    Hey, guys...My neighbors son has bought a jetboat.....It has a Dominator drive and a 454...He has been having problems with it- the heads were cracked(Among other things) and, after running it this past Sunday, he's getting steam out of the breathers and it still ain't running very good...I told him he should have someone with jetboat experience look at it because they could figure things out quick....But I don't know any near by.....San Leandro in the east SF bay area. Any people in the area? He also gets up to Sacto every other weekend...Thanks for any help!

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  3. #2
    Some guy obnoxious001's Avatar
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    Quote Originally Posted by cvxjet View Post
    Hey, guys...My neighbors son has bought a jetboat.....It has a Dominator drive and a 454...He has been having problems with it- the heads were cracked(Among other things) and, after running it this past Sunday, he's getting steam out of the breathers and it still ain't running very good...I told him he should have someone with jetboat experience look at it because they could figure things out quick....But I don't know any near by.....San Leandro in the east SF bay area. Any people in the area? He also gets up to Sacto every other weekend...Thanks for any help!
    It would not have to be a jet boat specialist, just a good shop that knows engines.

    Tell me what's been done about the cracked heads? I would assume they got replaced, if so, who installed them. Most big block Chevy engines require the head bolts to have a proper sealer on them to keep them from leaking water, with the exception of some of the newer engines that have "blind" head bolt holes that do not go into water jackets. The other place that could leak would be the intake manifold gaskets if they were not sealed properly, or if the bolts were not tightened in the proper sequence and have loosened up (easy to put a wrench on the intake bolts to verify).

    Another thing would be excess pressure from the jet pump into the engine. It's advisable to run a pressure bypass, but I think most jet boat owners get by with having a valve on the water line from the jet pump to limit volume and thereby back pressure in the engine.

    PM if I can answer any other specific questions as I don't look at the DLB section often.

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