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  1. #1

    Default Shovelhead valve stem seals are way larger then stock or S&S size?!

    The currently installed valve seals are very large which leads me to believe that whoever did the machine work did not cut the guides to fit stock seals. Does anyone know where I can find a larger stem seal? I tried both available sizes and there are no part numbers on my current seals.
    I will measure the valve stems tonight. The heads are heavily modified with larger valves and added spark plug. I'm not sure if they are worked stock heads or aftermarket. I will pull any part numbers on the head I see tonight.
    Last edited by Shovelstroker96; 10-12-2017 at 11:06 AM.

  2. #2
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    Only the later model shovelhead heads came with seals.........

  3. #3

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    Quote Originally Posted by Tattooo View Post
    Only the later model shovelhead heads came with seals.........
    I am aware of this...
    The bottom end is a newer 80 ci Delkron case the Jugs and internals are S&S. I am pretty sure the cylinder heads are S&S superstock. All of which were made well after 1981.

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    S&S is pretty proud of their products, and rightly so, if they are S&S heads they will have their Logo casted in right above the spark plug hole...
    The guides that they use are the late fat type ...
    PN for the seals is 90-2157 for a pack of 8

    If you bought the heads used, they could of had the guides machined for the earlier seals ....

    The sizes are:
    Pan/Shovel (1948-79) = .562"
    Shovelhead (80-84) = .625"
    Last edited by Dragstews; 10-12-2017 at 11:56 AM.

  5. #5

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    I will have to see if I tried those yet, it just sucks because last year I did a .020 + S&S top end rebuild and valves ground but reused the seals because I couldn't find the right seals and had a club ride so I had to throw it together quick. Worst part about it is I have to pull the motor to remove the rear cylinder head due to the tall S&S jugs!

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    Could go one step further with using KPMI valves and guides ...
    They set up at a super close fit requiring "No Seals"

    C630 bronze guides:
    C630 is a blend of copper, nickel, and aluminum.
    The high copper content gives excellent thermal
    qualities, the nickel makes the guide tough and
    wear resistant, and the aluminum brings work
    hardening characteristics. This bronze alloy
    allows for tighter clearances than other materials,
    creating better valve and seat sealing, as well as
    superior oil control. The expansion qualities of
    C630 bronze make it especially compatible with
    aluminum cylinder heads.

    Black Diamond™ Valves
    KPMI® Black Diamond™ one pieced forged
    stainless steel valves are impregnated by a special
    German process to improve wear properties and
    reduce friction. This process provides resistance to
    corrosion and wear that is superior to that of hard
    chromium and electrolysis nickel plating.
    Last edited by Dragstews; 10-12-2017 at 12:29 PM.

  7. #7

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    Sounds badass and expensive haha

  8. #8
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    There is an old saying in my neck of the woods .... "Ya get what you pay for."

    Click image for larger version. 

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  9. #9

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    I agree, I know it has the best parts money could buy in it but the guy who originally built the motor passed away. I am going to start pulling the front rocker cover now. I wonder if I can fit an overhead valve spring compressor in there, those cometic stainless head gaskets aint cheap lol

  10. #10
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    Quote Originally Posted by Shovelstroker96 View Post
    I am aware of this...
    The bottom end is a newer 80 ci Delkron case the Jugs and internals are S&S. I am pretty sure the cylinder heads are S&S superstock. All of which were made well after 1981.
    You didn't mention it in your question..... Were not mind readers over here............

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    Isn't it your turn to be .....


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    Quote Originally Posted by Dragstews View Post
    Isn't it your turn to be .....

    LOL yea I started to say that but I figured I'd let you do it this time..... LOL

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    cometic c9998 fits S&S heads

    James JGI-18000-48 will not

  14. #14

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    haha sorry guys, I didn't mean to come off as an A hole. I'm trying to add a picture here of the cating number on the head. I just pulled it off..

  15. #15

  16. #16

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    Holy carbon lol
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  17. #17
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    Those heads are not S&S, they be the Second run of the Shovels (75-78)
    AKA the Crown heads...

    Should use the .562" seals ...

    And .... Holy Big Bore ...



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    Last edited by Dragstews; 10-12-2017 at 3:30 PM.

  18. #18

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    So it looks like the S&S seals I got fit the valve. Although the seal just slides right over the guide and has play. The other size I got is even bigger around the guide. Do they require a crimp tool or something?! Also the valve is a Manley and has a B-PB markings. I'm guessing they are budget performance
    Attached Thumbnails Attached Thumbnails IMG_4739.jpg  

  19. #19

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    3-5/8

  20. #20
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    Quote Originally Posted by Shovelstroker96 View Post
    Holy carbon lol
    Click image for larger version. 

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    It doesn't look like much carbon to me...... It looks fairly clean, Just running a little rich but I like them running that way....... With dual plugs it needs to be richer.....

    By the way your heads didn't come with seals and If it was me I wouldn't worry about it.........
    Last edited by Tattooo; 10-12-2017 at 3:33 PM.

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