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Replacing Chevy 350 engine suggestions?

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  • Replacing Chevy 350 engine suggestions?

    It looks like we have to replace the 350 engine in my sonís 22ft BW Revenge. We can buy a brand new Chevy 350 with 4 bolt main, 2 pc rear seal engine for $1563.00 in stock locally. All the other things should fit on this engine since it is the same as the old one, we hope. This, of course, is not a marine engine, thus no warranty.

    What if we were to replace the seals and gaskets ( especially head ), the cam, and freeze plugs? All the other parts, like carb, fuel pump, starter, alt, are marine. What do you think about this approach to solving our re-power dilemma?

    The boat is used about 3-4 times a month from April to September for fishing in brackish water, and usually not run continually, except for trolling for 6 weeks in the spring.

    Are we to be concerned about longevity, or cracking a piston, throwing a rod, or other internal engine damage?
    Your input will be greatly appreciated. Thanks!


  • #2
    Re: Replacing Chevy 350 engine suggestions?

    We can buy a brand new Chevy 350 with 4 bolt main, 2 pc rear seal engine for $1563.00 in stock locally.
    Ayuh,....

    You can pretty much just dress that truck motor with the Merc. components from your take-out motor,+ Go Boatin'...

    Last I knew the GM crate motors are spec.ed for trucks,+ have composite headgaskets,+ brass coreplugs...
    The Cam,+ other internal components are a Non-issue...
    Any Grease is Better,..... Than No Grease at All.......

    Comment



    • #3
      Re: Replacing Chevy 350 engine suggestions?

      Thats a good price also, yep it's doable. And the easiest way to go.

      How old are the manifolds and risers another 500 bucks you can have new ones
      with gaskets and everything ready to install. All in one box, something you should consider.

      Good luck !

      Comment



      • #4
        Re: Replacing Chevy 350 engine suggestions?

        Cant beat a new engine from gm for reman prices. They probably wont honor the warranty though.
        88 Larson Citation DC 175
        165HP 3.7L I4 (470) alpha 1

        Comment



        • #5
          Re: Replacing Chevy 350 engine suggestions?

          If most or all of your boating is in brackish or salt now is also the time to add a fresh water cooling system (heat exchanger)
          Thats like wiping your butt before you go. You can do it, but it just don't make any sense.

          Comment



          • #6
            Re: Replacing Chevy 350 engine suggestions?

            I will echo what he said.

            Heat exchanger based cooling is definitly the way to go. Protect your engine from corosion and potential freezing. Let your exchanger take all the risk and abuse.

            Comment



            • #7
              Re: Replacing Chevy 350 engine suggestions?

              My boat is 23 years old saltwater used, still the same original manifold. Has a 22 year old saltwater used motor in it, If you flush every time you come off the water no reason why your new motor won't last that long.

              Point is i don't have the heat exchanger, a lot of boats don't have it.

              Why the old motor coming out may i ask, freeze damage??

              Really to many things go wrong with those fresh water heat exchangers, and they clog. They leak, i don't like them.

              Do a search for yourself on this forum make up your own mind.

              Good luck !

              Comment



              • #8
                Re: Replacing Chevy 350 engine suggestions?

                I tend to like closed cooling systems even in freshwater. With a heat exchanger you can run the engine at a more efficient hotter temp. 180 vs 160 . In addition its pressurized which increases the boil over temp.
                If you get a kit that includes the manifolds in the system they will last for the life of the engine.
                Instead of running corrosive sea water though your expensive engine you run it though a nickel-copper heat exchanger which is naturally corrosion resistant and anti marine growth.
                I have never had any trouble with any of mine clogging up, but your in an area with more marine growth. (over 1500hrs done nothing to the cooling system,other than impellers)
                I'm just bias against raw water coolings systems i have had nothing but trouble with them.
                88 Larson Citation DC 175
                165HP 3.7L I4 (470) alpha 1

                Comment



                • #9
                  Re: Replacing Chevy 350 engine suggestions?

                  In fresh water nobody needs a heat exchanger, period the boat will last longer then the owner.

                  Saltwater is the where it would be needed and thats the debate.

                  Just my 2 cents.

                  Comment



                  • #10
                    Re: Replacing Chevy 350 engine suggestions?

                    Originally posted by chiefalen View Post
                    In fresh water nobody needs a heat exchanger, period the boat will last longer then the owner.

                    Saltwater is the where it would be needed and thats the debate.

                    Just my 2 cents.
                    Were i boat its silty so it keeps it out of the block and manifolds, cuts down on corrosion even in freshwater and makes winterizing a breeze. Everyone is has there own opinion though.
                    88 Larson Citation DC 175
                    165HP 3.7L I4 (470) alpha 1

                    Comment



                    • #11
                      Re: Replacing Chevy 350 engine suggestions?

                      Abj is 100 percent correct, you have valid points and people do use the heat exchanger.

                      Comment



                      • #12
                        Re: Replacing Chevy 350 engine suggestions?

                        hi there this mean a 350 marine engine is the same as a automotive engine thanks.

                        Comment



                        • #13
                          Re: Replacing Chevy 350 engine suggestions?

                          Heat exchangers take less time to flush aswell...

                          IF you have a heat exchanger, you connect your muff's turn on your water, start your engine, let it idle for 30 seconds and your done.

                          If you don't have a heat exchanger, you have to wait until your engine reaches 160 degrees for your theromstat to open, otherwise the water won't actually be circulating through the block.

                          I know this isn't really that big of a deal, but it's the difference bettween letting your engine run for 30 seconds at the end of the day or 5-10 minutes.

                          Comment



                          • #14
                            Re: Replacing Chevy 350 engine suggestions?

                            beta have you been reading the thread??

                            Comment



                            • #15
                              Re: Replacing Chevy 350 engine suggestions?

                              Originally posted by betayv View Post
                              hi there this mean a 350 marine engine is the same as a automotive engine thanks.
                              Ayuh,... Where does it say that Anywhere in this thread,..??
                              Any Grease is Better,..... Than No Grease at All.......

                              Comment


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