Shovelhead top end rebuild help

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  • coffinhead
    Member
    • Oct 2016
    • 40

    Shovelhead top end rebuild help

    I'm wondering if anyone can help me out I have a 1980 fxs and need to replace the head gaskets getting some oil seepage and blow by his do I tell if I need to get new cylinders and piston and also if I get stock 80 inch piston and cylinders do I have to do anything to my original heads other then make sure flat and internals are ok ?
  • rokytnji
    • Mar 2024

    #2
    Might help. might not.



    Good Luck.

    I keep these on my shelf also.



    https://www.ebay.com/itm/1978-1-2-to....c100005.m1851 >>>>>> Mine is a physical book. Not a cd with a pdf on it.
    Last edited by Guest; 10-24-2017, 7:47 AM.

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    • coffinhead
      Member
      • Oct 2016
      • 40

      #3
      If I go with new stock cylinders and pistons my heads are ok size wise as long as they are flat correct ?

      Comment

      • rokytnji
        • Mar 2024

        #4
        Don't know. I have swapped to 80 inch heads on 74 inch cylinders on a 1200 cc earlier nose cone engine. Not enough detail in your answer. < Pics? >

        I was building a lower comprehension motor for easier kick only starting. Working good still for years .

        Could always do a squiish test before final assembly I guess. Or use



        One of these instead. Not that I expect you to know how to use the tools.

        Lately. I expect thread like these to go South real quick.

        Comment

        • Dragstews
          Senior Member
          • Sep 2010
          • 13740

          #5
          As long as you're in speck with the wall fit (For given piston) and the out of round/tapper also falls in spec... Be good to go...
          Keep in mind that the 80" cylinders are good up to a 0.030" overbore (Pistons are available in a 0.040" over, but the jugs really get thin at that bore.)

          All three castings of the Shovel's heads will interchange...
          Might want to let a shop freshen up the heads ...

          .../// http://www.jockeyjournal.com/forum/s...ning+cylinders \\\...
          Last edited by Dragstews; 10-24-2017, 10:35 AM.
          Take my 45 and outrun em all ..

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          • coffinhead
            Member
            • Oct 2016
            • 40

            #6
            Any body have any thought on these cylinders and piston should I replace

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            • coffinhead
              Member
              • Oct 2016
              • 40

              #7
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              • coffinhead
                Member
                • Oct 2016
                • 40

                #8
                Click image for larger version

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                • coffinhead
                  Member
                  • Oct 2016
                  • 40

                  #9
                  Click image for larger version

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                  • Dragstews
                    Senior Member
                    • Sep 2010
                    • 13740

                    #10
                    Look like many miles have been put on em...

                    Dang, if I would get the next size up from what bore it's at now ...

                    Your pistons looks to be cast Oem ...
                    Could get a set of Wiseco's .. They cost a bit more than the cast but money well spent....
                    Take my 45 and outrun em all ..

                    Comment

                    • coffinhead
                      Member
                      • Oct 2016
                      • 40

                      #11
                      Yes in thinking going for the wisecos what you you think about the jugs they look pretty rough to me ??

                      Comment

                      • coffinhead
                        Member
                        • Oct 2016
                        • 40

                        #12
                        Any cylinder recommendations to go with the wiseco pistons other then obvious s&s

                        Comment

                        • Tattooo
                          Senior Member
                          • Sep 2012
                          • 12407

                          #13
                          Originally posted by coffinhead
                          Any cylinder recommendations to go with the wiseco pistons other then obvious s&s

                          Why not just bore the ones you have now??

                          Comment

                          • Whoremonger
                            Senior Member
                            • Jan 2014
                            • 301

                            #14
                            Theres no way to tell about those cylinders without putting a bore gage to them.man no offense or disrespect meant but judging from your questions sounds like you are in over your head.save yourself lots of grief and money and take that motor to someone that knows what they are doing.good luck

                            Comment

                            • Dragstews
                              Senior Member
                              • Sep 2010
                              • 13740

                              #15
                              Originally posted by coffinhead
                              Any cylinder recommendations to go with the wiseco pistons other then obvious s&s
                              The pistons you would get from S&S are made by Wiseco ....
                              On your jugs:
                              What I was trying to say is to do what's called a clean-up bore, that is going 0.010" over from the bore your at.. (If your bore is at .030" now, may be best to get another set )
                              Take my 45 and outrun em all ..

                              Comment

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