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    383 stroker-gctid805077

    Looking to repower thinking about a 383 stroker. Looking for opinions and experiences with this engine

    Cheers
    John McLellan White Rock BC
    "Halifax Jack"
    1999 2855 383 stroker BII
    MMSI 316004337

    #2
    You may achieve the same hp but not the same torque.
    Be good, be happy, for tomorrow is promised to no man !

    1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

    '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

    Manalapan N.J

    Comment


      #3
      I went with the 383 Stroker when I re-powered our 2007 Bayliner 288 Discovery. Absolutely love the performance out of the hole and on long cruises. Have had it on two long shots up to Desolation and up to the Broughtons the following year. Heavily weighted down with supplies on both trips and couldn't be happier with the performance.

      Comment


        #4
        There's more to getting it right building an engine than just ordering up a 350 or 383. Sure going to a 383 will get more cubic inches, but unless the intake and exhaust system are adjusted too, nothing much is going to happen. This is where someone who really understands marine engines can take an average runner and make an engine system that really performs. It's not done by grabbing a bunch of gee whiz bang super what the drag boat racers are advertising, it's done by considering the boat weight, hull type, loading, gear ratios and customary loading. Things like balancing and blueprinting go without saying as does marine grade or better parts and components. The right cam and carb setup are where to look to those solutions. There's not going to be much that can be done with the exhaust manifolds, so that needs to be considered as well. Obviously Bhaven has a good combination going. Take your time finding the right person to build your engine, ask around at places like a balancing shop, or several marine service providers who's the best choice, or better, who who they would have build them an engine.
        P/C Pete
        Edmonds Yacht Club (Commodore 1993)
        1988 3818 "GLAUBEN”
        Hino EH700 175 Onan MDKD Genset
        MMSI 367770440

        Comment


          #5
          A friend repowered his 1988, 2858 with a 383 stroker marine engine and a Mercruiser Bravo II. The boat originally had an OMC King Cobra 7.5 (Ford 460). At the time I had a virtually identical boat with the OMC setup and an newly overhauled Ford 460. My boat performed well after the overhaul, but his boat would blow its doors off. It would get on plane quicker, it had 5-7 knots more top speed, and it used less fuel. So yes, a marine 383 is a good way to go.
          1999 3788, Cummins 270 "Freedom"
          2013 Boston Whaler 130 SS
          Anacortes, WA
          Isla Verde, PR

          Comment


            #6
            https://vancouver.craigslist.ca/bnc/bpo/6087498748.html
            Sea Venture
            2000 3055, 5.7/B2, 18x23" props
            Cruising the PNW and beyond.
            DIYC, Riverhouse Marina
            MMSI 316029971

            Kirk
            Drinks well with others.

            Comment


              #7
              I am of the opinion the B2 drive is the best B drive.

              BB Vs SB has been a discussion carried on between people forever.

              Yes less weight built correctly ... SB can and will be the correct solution for many people.

              Go to Michigan Motorz web site take a peek there make your decision, choose wisely.

              I wish you well !

              Did you read the add :

              2015 350HP 383 Mercruiser with additional cooling system. Just over 200+hours on the engine, in the 200+ hours the oil and filter has been changed four times with mercruisers 25/40 synthetic oil. Fresh water use only. Nothing wrong with this engine. In the end it did not have the power/torque I needed (larger heavy boat) and have settled on a 496. Since swapping this motor out it has been sitting in a covered shop. I initially had plans on putting this engine in a smaller boat, however the setup in that boat is a long way away from failing. Check out mercruisers site about this engine. With the right application this is a great engine with tons of power and torque.
              Be good, be happy, for tomorrow is promised to no man !

              1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

              '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

              Manalapan N.J

              Comment


                #8
                "Chief Alen" post=805152 wrote:
                Did you read the add :
                I did and wondered what model he was referring to and if he had the proper gear ratio and prop set up. Might be worth it for the op to send him an email :whistle:
                Dave
                Edmonds, WA
                "THE FIX"
                '93 2556
                Carbureted 383 Vortec-Bravo II 2.0:1 18 1/4x19 P

                The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
                Misc. projects thread
                https://www.baylinerownersclub.org/f...56-gctid789773

                Comment


                  #9
                  John, a few pieces of info that you'll want to know:

                  The 6.2L is a 377 cu in SBC that began as a 5.7L.

                  The dimensions are 4.000" bore with a 3.750" stroke. These are new engines from GM.

                  The 6.3L is a 383 cu in SBC that began as a 5.7L.

                  The dimensions are 4.030" bore and 3.750" stroke. These are remanufactured engines.

                  The 3.750" stroke crankshaft dimension comes from the old 400 cu in SBC that was used mostly in GMC and Chevy trucks.

                  Either of these above will come with the dreaded GM Full Dished pistons, of which cannot possibly create a quench effect!

                  This build is also more prone to Maine load Detonation!

                  In order for the 6.2L or 6.3L SBC to produce great torque, the pistons need to create a Q/E. This means NO GM full dished pistons! :evil:

                  If you have one custom built, you can go with a piston profile that takes advantage of the SBC cylinder head quench surface.

                  This reduces the risk of Detonation as well.

                  No other changes are required.

                  There will be a slight increase in cost for the pistons alone.... but the assembly is basically the same and will not require any more shop time.

                  If you go this route, you will now get some good torque from this build.


                  Rick E. Gresham, Oregon
                  2850 Bounty Sedan Flybridge model
                  Twin 280 HP 5.7's w/ Closed Cooling
                  Volvo Penta DuoProp Drives
                  Kohler 4 CZ Gen Set

                  Comment


                    #10
                    Mercruiser ratings are 390 for the stroker 370 for the 7.4
                    John McLellan White Rock BC
                    "Halifax Jack"
                    1999 2855 383 stroker BII
                    MMSI 316004337

                    Comment


                      #11
                      "hfxjack" post=805549 wrote:
                      Mercruiser ratings are 390 for the stroker 370 for the 7.4
                      [color]#000088 wrote:
                      Are these horse power numbers????

                      If so, look closely at the RPM at which these are being rated. Most often the RPM is much higher than what we will be operating at.

                      Example: when GM introduced the Marine version 5.7L SBC Vortec, they gave it a 315 hp rating..... BUT, the rating was acquired @ 5,200 RPM!

                      Who operates their cruiser at even near 5,200 RPM ???? :woohoo:

                      Point being....... these Marine hp numbers are often misnomers.

                      And..... what we want is TORQUE..... not necessarily horse power!

                      Torque is greatly increased by having an adequate stroke, good combustion chamber design, and the correct LPCP. [/color]
                      Rick E. Gresham, Oregon
                      2850 Bounty Sedan Flybridge model
                      Twin 280 HP 5.7's w/ Closed Cooling
                      Volvo Penta DuoProp Drives
                      Kohler 4 CZ Gen Set

                      Comment


                        #12
                        390 torque

                        350 hp

                        Both at 3500 rpm right in the sweet spot
                        John McLellan White Rock BC
                        "Halifax Jack"
                        1999 2855 383 stroker BII
                        MMSI 316004337

                        Comment


                          #13
                          Those first 200 hours are a concern especially when he says it was overloaded replaced with a 496 and no warranty not pay much more for new out of the box

                          Cheers
                          John McLellan White Rock BC
                          "Halifax Jack"
                          1999 2855 383 stroker BII
                          MMSI 316004337

                          Comment


                            #14
                            "hfxjack" post=805601 wrote:
                            Those first 200 hours are a concern especially when he says it was overloaded replaced with a 496 and no warranty not pay much more for new out of the box

                            Cheers
                            [color]#000088 wrote:
                            That engine listed on Craigslist is a 6.3L (aka 383 cu in) from Merc, and will have been fitted with the GM full dished pistons.

                            You can do much better by custom building one. [/color]

                            .
                            Rick E. Gresham, Oregon
                            2850 Bounty Sedan Flybridge model
                            Twin 280 HP 5.7's w/ Closed Cooling
                            Volvo Penta DuoProp Drives
                            Kohler 4 CZ Gen Set

                            Comment


                              #15
                              "hfxjack" post=805598 wrote:
                              390 torque

                              350 hp

                              Both at 3500 rpm right in the sweet spot
                              That's what I saw too John. Seems like a great fit.

                              2850Bounty has been beating that piston/quench drum for a long time and I also subscribe to it. It could very well be worth talking with a custom builder to incorporate this type of configuration. Jim Richmond in Port Kells is a very prominent engine builder in the area with the racing and hot rod crowd. He has a dyno too.
                              Sea Venture
                              2000 3055, 5.7/B2, 18x23" props
                              Cruising the PNW and beyond.
                              DIYC, Riverhouse Marina
                              MMSI 316029971

                              Kirk
                              Drinks well with others.

                              Comment

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