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Technical Mallory dual point for flathead

Discussion in 'Traditional Hot Rods' started by revkev6, May 17, 2020.

  1. revkev6
    Joined: Jun 13, 2006
    Posts: 3,351

    revkev6
    Member
    from ma

    Hey guys, I have been running a mallory YL series dual point ignition in my flat motor since 1992. Was bought new then. I recently picked up another last year at a swap meet. I am building a second motor. I try to put the distributor in an iron timing cover without the lower support and it bottoms out before you can clamp it. I put it in an aluminum merc cover with the lower support just like I'm running on my other motor and it wont fit in the upper hole! So I went and looked at the part numbers and the distributor in my running motor is the standard 2527501. The swap meet distributor is 2527502H. I havent found any information on this number. Obviously it is different. Anyone have the details on it? 20200517_150544.jpeg 20200517_150532.jpeg 20200517_143727.jpeg 20200517_143402.jpeg

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  2. Fordors
    Joined: Sep 22, 2016
    Posts: 4,647

    Fordors
    Member

    In the third photo it looks like a radius ground on the end of the shaft would let the distributor drop far enough to rest on the clamp area. Grind it a bit and see if that does it.
    You want some clearance so the gear is not pressing up on the distributor housing.
     
  3. There is no support for the bottom of the distributor to keep the gears meshed. In the second cover.
     
  4. revkev6
    Joined: Jun 13, 2006
    Posts: 3,351

    revkev6
    Member
    from ma

    Yup, I was going to do that but wanted to use an aluminum cover like I am using with the mallory on my other moyor. Then I hit a snag that this distributor wont fit in the aluminum cover. Never heard of such a thing!

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  5. Rand Man
    Joined: Aug 23, 2004
    Posts: 4,572

    Rand Man
    Member

    I will be following this. My son started to install my rebuilt Mallory into my 53 Ford V8 with no luck. Said it was too big a diameter and too long. I’m not exactly sure what was wrong, but I’m at a point where I need to install it.
     
  6. 24riverview
    Joined: Jan 13, 2008
    Posts: 1,008

    24riverview
    Member

    According to the 76 catalog, number difference only indicates a different advance curve. Couldn't find anything about the "H" at the end.
    Mallory 2.jpg
     
  7. 19Fordy
    Joined: May 17, 2003
    Posts: 7,709

    19Fordy
    Member

  8. tubman
    Joined: May 16, 2007
    Posts: 6,322

    tubman
    ALLIANCE MEMBER

    I have put a bunch of Mallory's into flatheads and have never seen this problem, (I usually like to use "flattops", though.) You don't suppose Speedway had a bunch of distributors made up that would only fit their proprietary timing cover. It is Speedway, after all.
     
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  9. revkev6
    Joined: Jun 13, 2006
    Posts: 3,351

    revkev6
    Member
    from ma

  10. revkev6
    Joined: Jun 13, 2006
    Posts: 3,351

    revkev6
    Member
    from ma

    Does anyone have the sketch of the distributor dimensions used to convert a sbc distributor to flathead? I cant seem to find it now. I would like to see how it matches up to what I have

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  11. revkev6
    Joined: Jun 13, 2006
    Posts: 3,351

    revkev6
    Member
    from ma

    Ok... little time with some sand paper on the ID of the cover and it starting going in... just a tight fit I guess! Still need to figure out what the 02H curve is though

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  12. revkev6
    Joined: Jun 13, 2006
    Posts: 3,351

    revkev6
    Member
    from ma

    So, I sent mallory a tech support to find more info on this distributor and had no luck.
    mallory had a list of common curves on their old/new part number scheme that 24riverview posted earlier. I have seen that sheet before but I haven't ever seen a breakdown of what the curves are?? anyone know??
     

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