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Buying reman longblock stock 5.7 mercruiser OR Vortec 5.7??

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  • Buying reman longblock stock 5.7 mercruiser OR Vortec 5.7??

    1992 Rinker Captiva 206 with Mercruiser 5.7 motor. Block cracked from lack of winterization...starts and runs just blows water everywhere and oul looks like milkshake. Thinking buying reman longblock will be best bet. Can do stock 5.7 replacement or can get 5 7 with Vortec heads for same price. Aside from needing new intake manifold for Vortec heads...what else would I need to buy that I can't reuse from old engine?
    pulleys/accessories?
    fuel pump?
    different carb or rejet?
    Etc...

    any help would be appreciated

  • #2
    I'd do the upgrade in a flat second. Yes, needs different manifold. Probably needs rejetting.

    And other issues are that most Vortec blocks will have serpentine belt setup as opposed to a V-belt setup. And you nailed it - no Vortec block will have a mechanical fuel pump port. Have to go electric.
    17 Foot '90 Bluewater
    Alpha 1 3.0 Merc - repowered in 2016
    now - 4.3L Vortec - Alpha 1 GenII
    Honda BF100L kicker
    Engine custom - Transom 0D65328 - Drive 0D648864
    If you ain't fishin, then yer working too much.

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    • #3
      So electric fuel pump, intake manifold, pulley/belt setup is all I would need to change as well as rejetting the carb? Any ideas on places to get a pulley/belt setup and untake manifold?

      Comment


      • #4
        Originally posted by SDB View Post
        So electric fuel pump, intake manifold, pulley/belt setup is all I would need to change as well as rejetting the carb? Any ideas on places to get a pulley/belt setup and untake manifold?
        Personally I'd get a pre-vortec short block and buy the Vortec heads and intake separately. Basically that's what the 4.3L is in my boat. That way I didn't have to change all the bolt on accessories up front to get serp belted stuff.
        17 Foot '90 Bluewater
        Alpha 1 3.0 Merc - repowered in 2016
        now - 4.3L Vortec - Alpha 1 GenII
        Honda BF100L kicker
        Engine custom - Transom 0D65328 - Drive 0D648864
        If you ain't fishin, then yer working too much.

        Comment


        • #5
          Originally posted by SDB View Post
          1992 Rinker Captiva 206 with Mercruiser 5.7 motor. Block cracked from lack of winterization...starts and runs just blows water everywhere and oul looks like milkshake. Thinking buying reman longblock will be best bet. Can do stock 5.7 replacement or can get 5 7 with Vortec heads for same price. Aside from needing new intake manifold for Vortec heads...what else would I need to buy that I can't reuse from old engine?
          pulleys/accessories?
          fuel pump?
          different carb or rejet?
          Etc...

          any help would be appreciated
          Ayuh,..... Welcome Aboard,...... Go for the Vortec long block,.....

          Yer pulleys, belts, 'n accessories will mount up to it,....
          Bein' a '92, ya might already have an electric fuel pump, which the Vortec block will need,....
          If it's got a mechanical, ya, ya need an electric one,.... 'n proper wirin',....

          Ya haven't said which carb ya got now, if a 2bbl, spring for an edlebrock 1409 4bbl, 'n matchin' intake manifold,.....
          If a Quadra-jet, or Merc/ Weber AFB, no need to change anything,....

          Comment


          • #6
            Originally posted by Bondo View Post

            Ayuh,..... Welcome Aboard,...... Go for the Vortec long block,.....

            Yer pulleys, belts, 'n accessories will mount up to it,....
            Bein' a '92, ya might already have an electric fuel pump, which the Vortec block will need,....
            If it's got a mechanical, ya, ya need an electric one,.... 'n proper wirin',....

            Ya haven't said which carb ya got now, if a 2bbl, spring for an edlebrock 1409 4bbl, 'n matchin' intake manifold,.....
            If a Quadra-jet, or Merc/ Weber AFB, no need to change anything,....
            Really? I thought all the pulleys and attached accessories changed to serpentine starting sometime in 96 forward. I guess that means the front seal and balancer is the same either way? Learning something here.
            17 Foot '90 Bluewater
            Alpha 1 3.0 Merc - repowered in 2016
            now - 4.3L Vortec - Alpha 1 GenII
            Honda BF100L kicker
            Engine custom - Transom 0D65328 - Drive 0D648864
            If you ain't fishin, then yer working too much.

            Comment


            • #7
              Thinking buying reman longblock will be best bet.
              Ayuh,...... He's buyin' a long block crate motor, I believe,.....

              No pulleys on a long block, gotta use the dressin's from the take-out motor,.....

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              • #8
                Get yourself an air gap manifold. Dual plane aluminum. Unless you are in salt water then get either a lined water jacket aluminum or get an iron dual plane.
                87 Formula F223LS, 2016 383 Stroker, 2019 Davis Unified(HEI) Ignition, Quickfuel Marine 750
                Lake Winnipesaukee, NH

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                • #9
                  Thanks for all the suggestions...maybe I can order my reman motor to be old style block like I have just with Vortec heads/valvetrain....then get an intake....have to look at my carb and see what it is.. if I only have to buy and intake and rejet my carb I will get the vortec heads...I know they are good for at least 30 hp

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                  • #10





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                    • #11
                      This is the boat and trailer just bought Sunday morning...m guy had it listed for a bunch..then changed it to $1000. I was lucky enough to looking at FB Marketplace exactly when he redid ad...contacted him and drove directly to his house about 45 min away with my truck and got ir. He owned it 20+ years never had an issue ...put brand new starter and battery in it and when he went to stary it water everywhere....had it in pole barn but didn't winterize it soon enough....inthink he was pissed/disgusted and wanted to get rid of it right then and there. Came with life javlckets, stereo, air horn, manuals, skis, oars, anchor/ropes/buoys....4 blade prob and 3 blade prop...and $2.84 in change in cup holder! I wanted a Pontoon but felt like for $1000 a boat/trailer combo was a good deal and it's clean/good shape....interior nice...everything seems to work just needs a new longblock. I cam do the mechanical work myself with a mechanic friend at his shop and have and other friend that works at a Marina. I cam get a Jasper motor for 2850 (since my core is bad) or a Michigan Motorz longblock for $2500 with tax if I pickup (2 hrs away). So I'll be in the whole project.for $3k cash and some labor....can't get hurt that way. Bought a nice cover and going to clean/detail/polish/wax it this weekend weather permitting.

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                      • #12
                        I would buy a 377 or 383 stroker myself
                        Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

                        1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

                        Past Boats
                        1970 Wooster Hellion - Merc 9.8
                        2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
                        1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

                        What’s behind you doesn’t matter.Enzo Ferrari

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                        • #13
                          I don't want to change the Alpha drive unit and I was told not to go much over 300 hp. Trying to be cheap as possible on this project....but year a 383 would be great! I am going to try to call Michigan Motorz and verify that I can reuse my belts/pulleys from my original block on the Vortec block and if so I'll order that one.

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                          • #14
                            plenty of 6.2 strokers in front of alpha drives...... just have to watch your hole shot,...... and you need to run a rev limiter if you ever come out of the water, the re-entry will kill the drive.

                            However even a 5.7 can grenade an alpha if you come out of the water.

                            you may need 1/4" spacers behind a few pulleys and brackets to fit your old accessories.
                            Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

                            1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

                            Past Boats
                            1970 Wooster Hellion - Merc 9.8
                            2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
                            1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

                            What’s behind you doesn’t matter.Enzo Ferrari

                            Comment


                            • #15
                              Sign up today
                              I'm going to order the reman Vortec long block....get a cast iron Vortec intake....check the carb...see if it has electric fuel pump.....get new water pump....and check/replace all the other bits and pieces...just want tonget it in the water enough this year to break in motor and then store for winter.

                              thanks for the input

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