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Technical Flathead 3/4 cam stamps, and magneto identity.

Discussion in 'The Hokey Ass Message Board' started by Jebo, Mar 13, 2021.

  1. Jebo
    Joined: Apr 24, 2007
    Posts: 163

    Jebo
    Member

    I found a camshaft and was wondering if anyone knew what the manufacture of it was. Thanks IMG_2310.JPG


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  2. Here's a bump - wonder if it could have been a re-ground cam ?
     
  3. akoutlaw
    Joined: May 13, 2010
    Posts: 1,258

    akoutlaw
    Member

    IMHO; Put it in a block & degree it. At least you will know all the pertinant info about it. Then you can start looking at the past & current brands specs. There's a good chance that it will match some brand name's model. o_O
     
  4. Budget36
    Joined: Nov 29, 2014
    Posts: 13,174

    Budget36
    Member

    Cool thread, hope you can get your answer. This is only the 2nd time I’ve seen verified “3/4” cam information, the other was posted in an article from a magazine ( sorry I don’t recall who) about building a 265 Chevy way back when.
     
    Jebo likes this.

  5. If I had to hazard a guess I would guess that it is a regrind. Here is my reasoning on it. The top stamping looks like it is done over some older numbers/letters.

    my next guess is that it is around 270 duration. this would be because of the 3/4 stamped on it. The way it was once explained to me by a cam grinder of note is that the 3/4 race cam moniker came from duration of 270 degrees was 3/4 of 360 degrees.

    Mostly everyone will disagree with that but it really does not matter that much as I am just hazarding a guess.
     
    Jebo, Desoto291Hemi and Budget36 like this.
  6. 1971BB427
    Joined: Mar 6, 2010
    Posts: 8,717

    1971BB427
    Member
    from Oregon

    Wonder if it's a Sig Erson camshaft?
     
  7. lippy
    Joined: Sep 27, 2006
    Posts: 6,825

    lippy
    Member
    from Ks

    Wonder where the other 1/4 went? I know that was a common moniker. 3/4 race. Lippy
     
  8. Matt55folife
    Joined: Nov 28, 2020
    Posts: 127

    Matt55folife

    Finally!!!! A picture of one of those 3/4 race cams ive herd about for years from all those people that know everything about hot rods but dont seem to have one!!!! Im on bored with a re grind. Those numbers are definitely hand punched. I guess the big question is have u ran it?


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    Jebo likes this.
  9. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 6,250

    Ebbsspeed
    ALLIANCE MEMBER

    My thought as well. Usually the Erson cams had the entire name stamped into the cam. This Erson has the same block lettering as the O/P's photo.

    Erson Cam.jpg
     
    stillrunners likes this.
  10. Jebo
    Joined: Apr 24, 2007
    Posts: 163

    Jebo
    Member

    I will attempt this, thanks.


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  11. Jebo
    Joined: Apr 24, 2007
    Posts: 163

    Jebo
    Member

    Thanks for all the comments. I will try to run it in my motor once I find out what it really is.


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  12. lippy
    Joined: Sep 27, 2006
    Posts: 6,825

    lippy
    Member
    from Ks

    That M with a circle around it may be a clue. Lippy
     

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