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305 Mercruiser Vortec Heads ?

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  • 305 Mercruiser Vortec Heads ?

    Can anyone tell me if my 305 would have Vortec Heads? Engine No 0W012412.
    I was looking into getting a Edelbrock manifold and 4 barrel carburetor and wanted to know if Edelbrock performer manifold part # 2516 would suit my Engine?
    Also thoughts on Edelbrock # 1409 - 600 CFM carburetor with this manifold combination would give me much more power than my standard mercarb 2 barrel carburetor?
    Thanks

  • #2
    Ayuh,...... Look at where the intake, meets the heads,.....

    If there are 12 bolts, 6 to a side,...... Their Not Vortec,......
    If there are 8 bolts, 4 to a side, with none in the center area,.... Those are Vortec heads,.....

    The 1409 is a carbon copy of the Merc/ Weber carb, that Merc has been usin' since the early '90s,.....

    You'll get about 20 hp increase, mostly at top-end, but improved acceleration throughout the rpm band,....

    Comment


    • #3
      Thanks Bondo 👍🏼

      I will get to the boat tomorrow and have a look.

      Its a 2004 model so I’m thinking it should have Vortec heads ? Also from memory the rocker cover has bolts along a line in the center I think that is also a Vortec thing?

      Comment


      • #4
        Yours should be a vortec as bondo stayed look for 8 vertical intake bolts vs 12.

        I have the same boat as you. I replaced the 4.3 that the previous owner cracked with a 5.0. I had real good results with the 1409 on it. Real good throttle response. I did end up going one notch ritcher on the primary metering rods (.65 x .42) and using the .043” accelerator pump nozzle to cure and off idle stumble.

        You will Need Merc part number 805359T throttle bracket as your original has different bolt spacing for the Mercarb. Your throttle cable, slave solenoid, and 12v circut breaker will bolt up to this bracket same as on your mercarb bracket for a clean factory installation.

        You will also need a different flame arrestor to fit the bigger carb, and the fuel line will likely need to be modified or replaced as I think the fuel comes in the front of the mercarb vs left hand rear on the edelbrock. There are some aftermarket marine premade fuel hoses of various lengths available or you can use 3/8 preflared brakeline from any auto parts store if needed.

        On a separate note what wakeboard tower tower do you have and did the original Bimini fit under it ?
        Last edited by Scott06; February 9th, 2019, 07:29 AM.

        Comment


        • #5
          Hi Scott

          Yes you were right I just checked and confirmed it does have Vortec Heads.

          Thanks for the info on the throttle bracket I will order one today.

          Also thanks for the feedback on the 1409 metering rods and accelerator pump changes as this will be sure to save me some time in tuning.

          I only bought the boat a few months ago with very low hours (130) from a guy who imported it from the US (As I’m in Sydney Australia) and it has had very little use.

          The Bimini does fit under the sports tower and I think it’s all original specs. The sports tower still has a part number sticker on it (200 sport 1759642) written on it.

          Any chance you could post a picture of your fuel line set-up?

          Thanks



          Comment


          • #6
            Just looking through parts drawings... You have an electric fuel pump. It looks like all the 4bbl SBC (305 and 350) engines were a mechanical pump, so a new line from the electric pump to a 4bbl carb will need to be a custom fabrication. May I suggest you get it made in stainless steel.

            Chris.....
            xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
            The world takes on a whole new perspective when viewed from 100’ below.
            1972 Bertram ‘Bahia Mar’ 20
            2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
            (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


            Comment


            • #7
              I don't be have good pic handy but this link shows where the fuel line comes in an edelbrock carb https://www.michiganmotorz.com/vorte...ment-p-58.html

              while your merc set up will be a little different fuel pump in this aftermarket set up is in basically the same location as your stock set up.

              Comment


              • #8
                Hi Chris

                Yes it’s does have an electric fuel pump but only a 2 barrel mercarb.

                I was thinking of getting a hose doctor (Pirtek or Enzed) to make up the fuel line? In marine grade fuel line with swage fittings. What do you think?



                Comment


                • #9
                  Originally posted by Davidsgara View Post
                  Hi Chris

                  Yes it’s does have an electric fuel pump but only a 2 barrel mercarb.

                  I was thinking of getting a hose doctor (Pirtek or Enzed) to make up the fuel line? In marine grade fuel line with swage fittings. What do you think?


                  That's what I'd do. (How's the drive trolley coming along?)

                  Chris.......
                  xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                  The world takes on a whole new perspective when viewed from 100’ below.
                  1972 Bertram ‘Bahia Mar’ 20
                  2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
                  (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


                  Comment


                  • #10
                    I ended up just getting using my engine stand and made up a bracket to suit.

                    As my boat is stored on a boat ramp it was too difficult to make up your style lift and make it work on a slope even though I appreciate you taking the time to measure up for me.

                    Also ended up getting a gasket for my distributor told the local merc guy what you said and he ordered it straight away.

                    I’m really happy to be part of this forum as I would really struggle without the experience of all you guys.

                    Im sure I will have plenty of questions to ask in the future.😊

                    Comment


                    • #11
                      Cheers for the picture Scott👍🏼

                      Comment


                      • #12
                        Originally posted by Davidsgara View Post
                        ...Also ended up getting a gasket for my distributor told the local merc guy what you said and he ordered it straight away....
                        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                        The world takes on a whole new perspective when viewed from 100’ below.
                        1972 Bertram ‘Bahia Mar’ 20
                        2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
                        (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


                        Comment


                        • #13
                          Do I need to use specific intake manifold gaskets?

                          Comment


                          • #14
                            Just a question on the 2516 manifold how’s it go in salt water?

                            Comment


                            • #15
                              Sign up today
                              Ayuh,...... Unless an aluminum intake has bronze lined water passages, it should Not be used in saltwater,......

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