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  1. #1
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    Default 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 ?

  2. #2
    rokytnji
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    Might help. might not.



    Good Luck.

    I keep these on my shelf also.

    https://www.ebay.com/itm/Harley-Davi...-/122770846683

    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 rokytnji; 10-24-2017 at 7:47 AM.

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

  4. #4
    rokytnji
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    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

    https://www.amazon.com/Proform-66792.../dp/B000CPCA5G

    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.

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    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 at 10:35 AM.

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

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    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....

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

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

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    Quote Originally Posted by coffinhead View Post
    Any cylinder recommendations to go with the wiseco pistons other then obvious s&s

    Why not just bore the ones you have now??

  14. #14

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    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

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    Quote Originally Posted by coffinhead View Post
    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 )

  16. #16

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    Coffin head, if you clean up the top of the piston they should be stamped with a size?

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    I may have the solution to this dilemma ...

    In the classifieds I have a pristine set of 80" jugs that are at Std bore..
    Been for sale for quite a while ...

    What I could do is an exchange for your jugs "IF" they are also in good shape with no broken fins or out to max bore...

    I can take my jugs out to .010" and fit new Pistons of your choice ...
    If interested in doing this deal, PM me and we'll talk Turkey ...

    Click image for larger version. 

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    Last edited by Dragstews; 10-25-2017 at 10:45 AM.

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    I don't think anyone has said it yet... But even if you buy a new set of jugs you will still have to have them checked to the size of the new pistons..... It's not just plug and play if that's what your trying to get around..........

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    And each piston manufacturer has their own wall fit for their pistons...

    Wiseco's fit up close at .003" ... Oem cast is .001"
    Not all requires the same wall fit...

    I see you live in Canada .... Surely there is a shop close to you that can do a wiz-bang job with fitting oversize pistons ....
    But first you gotta know the size of what ya got ... You don't wanta be packing a set of .030" over jugs down to the shop and then they tell ya to take those home and make doorstops out of em ...

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    Quote Originally Posted by Dragstews View Post
    And each piston manufacturer has their own wall fit for their pistons...

    Wiseco's fit up close at .003" ... Oem cast is .001"
    Not all requires the same wall fit...

    I see you live in Canada .... Surely there is a shop close to you that can do a wiz-bang job with fitting oversize pistons ....
    But first you gotta know the size of what ya got ... You don't wanta be packing a set of .030" over jugs down to the shop and then they tell ya to take those home and make doorstops out of em ...
    Can't he just invest in those LA tubes, liners and have those pressed in? I know that is only slightly more expensive than a set of moco new old stock ones...ha h a h a

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