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    Carb replacement suggestions

    My 2003 5.7L carb is in need of rebuild or replacement. It's the original 3310-864943A01 2BBL MERCARB. A new OEM replacement is ~$760 but a ROCHESTER replacement from I5 Auto for ~$335 off Amazon. Anyone have experience with the ROCHESTER or suggestions? A rebuild kit is probably ~$60 but I might go with a replacement and rebuild the original as a backup.

    I had read where some replace with a 4BBL but not sure if this option would be worth the cost and work. The OEM 2 BBL carb worked great for my 245 until my idle became erratic along with the choke at startup. Went for 15 years with no trouble.

    Thanks
    It's all a dream
    '03 245 5.7/BIII & '06 175

    #2
    Going with a four barrel requires an intake manifold also. Sounds like you’ve been satisfied with the mercarb, I’d rebuild it first. the rodchester replacement or equivalent would also be good if ya want to spend some extra.
    Dave
    Edmonds, WA
    "THE FIX"
    '93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
    (.030 over-Vortec top end-part closed cooled)
    The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
    Misc. projects thread
    https://www.baylinerownersclub.org/f...56-gctid789773

    Comment


      #3
      Well if the Mercarb is similar to a 2bbl Rochester, it is a simple carb to rebuild. Why not have at it yourself? As long as it is not corroded inside, you have nothing to lose. I rebuilt my 30 year old Quadrajet last summer and it wasn't near as difficult as I was led to believe and the Rochester Q-Jet is an quantum leap more complex than the 2bbl.
      I looked at the pix on the Crowley marine site. It looks like a simple carb to rebuild. I'd try it just remember 90% of a good carb rebuild is the cleaning. If you have a good original core, it can be better than the ones you buy from rebuilders which can be pieced together from several different carbs. Click image for larger version

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      88 Four Winns 200 Horizon 4.3 OMC
      98 Jeep Grand Cherokee 4.0/Selectrac
      07 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

      Long Island Sound Region

      Comment


      • Gsherwood
        Gsherwood commented
        Editing a comment
        +1 on that. The devil you know...

      #4
      Find the local shop, or relatively nearby shop, that specializes in carbs. Someone who does work on classic cars and muscle cars. They will do yours at probably the best price, and you are dealing with a carb that works more like a performance car than the family truckster. If all else fails, call Carb Connection in Kirkland, WA to arrange sending it there.
      P/C Pete
      Edmonds Yacht Club (Commodore 1993)
      1988 3818 "GLAUBEN”
      Hino EH700 175 Onan MDKD Genset
      1980 Encounter Sunbridge "Misty Blue" (Sold)
      MMSI 367770440
      1972 Chevrolet Nova Frame off Resto-mod in the garage
      Boating on the Salish Sea since 1948

      Comment


        #5
        Thanks for the quick feedback all.

        I think I will take the advice and just rebuild the one I have. It's been years since I rebuilt a carb but I remember it being pretty straight forward. It's probably pretty similar to the carb I had and rebuilt on my 66 Mustang Fastback with a 289.

        Thanks

        It's all a dream
        '03 245 5.7/BIII & '06 175

        Comment


          #6
          That 2bbl Mercarb like you Mustang autolite are some of the easiest carbs to rebuild. Key is cleaning out all the ports throughly.
          1997 Maxum 2400 SCR 5.7LX Bravo II

          Mike

          Comment


            #7
            Originally posted by Nauti_Mike View Post
            That 2bbl Mercarb like you Mustang autolite are some of the easiest carbs to rebuild. Key is cleaning out all the ports throughly.
            What is the better Carb cleaner dip? I do have compressed air to blow out the ports.
            It's all a dream
            '03 245 5.7/BIII & '06 175

            Comment


              #8
              Originally posted by Don9 View Post

              What is the better Carb cleaner dip? I do have compressed air to blow out the ports.
              I would soak it in a dip cleaner but also use a can spray to shoot through the passages and follow up with air.
              1997 Maxum 2400 SCR 5.7LX Bravo II

              Mike

              Comment


                #9
                just remember 90% of a good carb rebuild is the cleaning.
                The term carburetor "rebuilding" is somewhat of a misnomer.
                Unless some of the parts are worn and require replacement..... it is truly a cleaning more than anything.


                .
                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


                • Nauti_Mike
                  Nauti_Mike commented
                  Editing a comment
                  Reconditioning would be the proper term.

                #10
                If your carb is a Holley be sure to replace the power valve. That may be the sole issue. When the power valve fails due to ruptured diaphragm excess fuel spills into the intake causing a rich mixture. The simple test for that is attempting to adjust idle mixture. If you find you can't lean the mixture out to where the engi e stumbles the valve is likely leaking.
                Tony Bacon,
                Washougal, WA
                Caspian
                1997 3788 Twin Cummins 250hp

                Comment


                • Nauti_Mike
                  Nauti_Mike commented
                  Editing a comment
                  Post 1 say 2bbl Mercarb.

                #11
                Berryman for dip.

                The power valve should come with kit.
                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


                • Don9
                  Don9 commented
                  Editing a comment
                  Thanks Chief

                #12
                Be sure to check the number stamped on the power valve. An automotive kit will come with the wrong one and you will have to order the correct one separately.
                Tony Bacon,
                Washougal, WA
                Caspian
                1997 3788 Twin Cummins 250hp

                Comment


                  #13
                  Never seen a 2BBL MERCARB on any auto on this planet.

                  True it is a 2 barrel Rochester clone .

                  Check this out ...

                  https://www.ebay.com/itm/Mercruiser-....c100005.m1851
                  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


                    #14
                    I noticed while looking for a rebuild kit they sometimes referred to my carb part number as a Rochester. Seems like many different manufacturers for the kit and each was a little different. The one I picked covers a few different carb part numbers and includes two different power valves. I just need to match with my old parts.

                    Thanks all for the help
                    It's all a dream
                    '03 245 5.7/BIII & '06 175

                    Comment


                      #15
                      Originally posted by Chief_Alen View Post
                      Berryman for dip.

                      The power valve should come with kit.
                      I was researching chem-dip and found Berryman as a good choice over Gunk but I also kept seeing people suggesting a Pine Sol/water mix as well. Have you every tried this or heard of others using Pine Sol?

                      Just curious
                      It's all a dream
                      '03 245 5.7/BIII & '06 175

                      Comment

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