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  1. #21
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    IDK if I want to suggest a cam ....
    Not knowing how the springs are packed could cause a world of problems sticking more of a cam than the lift of the old Sifton ...

    So .... I'm going to keep my pie-hole shut ....

    Last edited by Dragstews; 03-25-2020 at 2:50 PM.

  2. #22

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    Quote Originally Posted by Dragstews View Post
    IDK if I want to suggest a cam ....
    Not knowing how the springs are packed could cause a world of problems sticking more of a cam than the lift of the old Sifton ...

    So .... I'm going to keep my pie-hole shut ....
    I'm comfortable staying with the lift his old cam had, maybe plus ten or twelve thou. Of course always best to go through the heads and be sure.

    Jim

  3. #23
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    L-5 has a .519" lift ...

    .044" more than the 105 ....
    That would spook me ... !!!

    Last edited by Dragstews; 03-25-2020 at 2:59 PM.

  4. #24

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    Gaskets are pretty cheap, I don’t mind pulling the heads and taking measurements if it means y’all will help me pick the best cam for the job. What do you need from me to help?

  5. #25
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    Go ahead and pull the heads, lets take a gander at what's there ...

    Ya just might have some Manley SHOVEL HEAD 74 and 80 CID (1966-1984) .500” - .650” springs in thar ... ??
    Last edited by Dragstews; 03-25-2020 at 3:26 PM.

  6. #26

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    Quote Originally Posted by drohagan View Post
    Gaskets are pretty cheap, I don’t mind pulling the heads and taking measurements if it means y’all will help me pick the best cam for the job. What do you need from me to help?
    Always the wisest course of action.

    Jim

  7. #27

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    Stay tuned, hopefully will have some pics for ya this evening

  8. #28
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    If ya would like to see what the Accelerator program thinks about the cam choices ....
    I can run a few programs for .....

    Last edited by Dragstews; 03-25-2020 at 4:55 PM.

  9. #29

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    So here are some pictures of the front head/cylinder.
    Measured the bore as best as I could with the cheap calipers I have. Got 3.4565" for the cylinder bore.
    Also, any tips with getting my pictures to upload right-side up would be great as well.

    Click image for larger version. 

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  10. #30
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    Well I'll be ....

    Those are the 3-7/16" jugs bored .020 over .... Kiss my grits, those are some rare jugs ...

    Valve springs looks like S&S stuff ... ???

    Click image for larger version. 

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    If so ....

    550" lift double valve spring kit for 1948-'84 Harley-Davidson® panhead and shovelhead engines.

    Includes 4 inner springs, 4 outer springs, and 4 aluminum top collars.
    Use with stock-style bottom collar, valve guides, valves with stock 3/8" stem, and stock keepers.

    Could be .... ???

    Wait a second ... Do I see three springs .. ???







    '
    Last edited by Dragstews; 03-25-2020 at 7:28 PM.

  11. #31

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    So what does that give me for displacement and what does this give me for cam options? I did double check the 4-3/4 stroke as well. Ill have to get a closer picture of the springs.
    Last edited by drohagan; 03-25-2020 at 7:31 PM.

  12. #32
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    Also looks like the old TRW pistons ...
    Been a few years since those have been around. Think S&S went to Wisceos about 2004 ..

    Cubes are at 89.12 inches ..
    Last edited by Dragstews; 03-25-2020 at 8:37 PM.

  13. #33

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    Sifton 3030 spring set with their black top collars to match the cam would be my guess. Could be S&S.

    Yes, TRW 2800 or 2900 pistons made for S&S. One of the best forged pistons for shovels ever made. Those pistons will yield a listed 9.0:1 compression ratio with the 4 3/4 stroke. You can bet it might be a tenth or two lower, depending on how much the valves are sunk, affecting the volume of the combustion chamber.

    Given that, the cam you had was WAY more than needed, giving a soft bottom end in exchange for horsepower in a range of rpm beyond normal operation.

    I'm interested to see what Drag's wizard box says about a cam choice. My AccelPro didn't work with my new computer fifteen years ago, so I quit using it.

    I would choose a cam that closes the intake valve at around 50 degrees ABDC, at .050/.053 lift timing.

    Jim
    Last edited by JBinNC; 03-26-2020 at 5:40 AM.

  14. #34

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    Interested to see what you come up with! I was glad to not see any scoring in the cylinders, everything seems good in the top end. At least with the front cylinder. So with these 3-7/16 jugs, do I need a special head gasket? By the way this will be going in a kick only street bike if that makes a difference for cam choice.

  15. #35

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    Given that those motors are hard on rings, I would rering it since you are this far down. Long stroke, short skirt, and loose clearance means shorter ring life. Standard shovel rings will fit those pistons.

    You can use a standard shovel head gasket, but use a good one, no blue Teflon gaskets!

    Jim

  16. #36
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    Quote Originally Posted by JBinNC View Post

    I'm interested to see what Drag's wizard box says about a cam choice.
    So was I ....

    This is with the 105 cam ...

    Click image for larger version. 

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    On the head gasket choice ... Hard to beat James Fire Ring ...
    If you're up for a little work you could machine a .004 step on the gasket surface of the jugs... That allows for a bit more crush on the metal fire ring ... (Poor Boys O-Ringing, per say)
    All of S&S cylinders has that step for the Shovels. ..

    Click image for larger version. 

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    Last edited by Dragstews; 03-26-2020 at 6:25 AM.

  17. #37
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    The springs that you took out of my S&S Heads had 3 springs per valve Jesse, I'll have to look at the keepers and all when I get home to see if they look the same.

    Jake

  18. #38

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    Torque curve for that 105 looks better than I would have thought.

    Jim

  19. #39
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    Click image for larger version. 

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    Click image for larger version. 

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    Last edited by Dragstews; 03-26-2020 at 6:38 AM.

  20. #40

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    All of these cam specs are very new to me and rather than guessing and making a mistake, do you have any suggestions for a cam that fit in the "Choose a cam that closes the intake valve at around 50 degrees ABDC, at .050/.053 lift timing" catagory? From that last picture it looks like the L5 is off the table without head work, what about the #7?

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