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Technical Flathead flywheel help

Discussion in 'The Hokey Ass Message Board' started by Vanness, Feb 17, 2019.

  1. Vanness
    Joined: Aug 5, 2017
    Posts: 404

    Vanness
    Member

    783D848D-8345-4994-9660-8F83659F9413.jpeg 1448A6E4-F1B9-4899-AC51-1F70FBA5FBF9.jpeg here we go again. Have two flywheels. Both 48-53. One has 11” bolt circle. And one has 10.5 bolt circle. See pics. Both take or look to have had a 10” disc (long). Did they make 10.5”? If so, what application? I know they had 10” and 9.5. Also, I would like to redrill for 9.5 or 10” clutch to not hit on early top loader trans as I bolted up big clutch from truck and it was a no go.

    Thanks as always.
    Anyone near me want to trade for car flywheel with small pattern :)
     
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  2. rusty valley
    Joined: Oct 25, 2014
    Posts: 745

    rusty valley
    Member

    10.5 was the mercury borg &beck type pressure plate. only early trannys have a problem with the bigger pp. if you have a 78 series case all will fit. if you have to drill it, i would go for just a 9"--less rotating weight, and you dont say what your building, but most likely not 400 hp in a truck. 9" is all you need. if you go shopping, the 8ba flywheels have pp bolt holes drilled all the way thru, the 48 on back are not.
     
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  3. deucendude
    Joined: Oct 31, 2008
    Posts: 502

    deucendude
    Member
    from norcal

    59 flywheels and 8ba flywheels are not interchangeable.
     
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  4. rusty valley
    Joined: Oct 25, 2014
    Posts: 745

    rusty valley
    Member

    correct, deucendude, thats why i put the shopping tip in there, but you made it more clear, good for that. i also want to add, what ever size you decide to go with, do not buy the cheapest thing on ebay. buy from ft wayne clutch, american made, balanced, and no further problems after first start up
     
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  5. 34fordjay
    Joined: Sep 10, 2009
    Posts: 86

    34fordjay
    Member
    from Mass USA

    X2 what rusty valley and deucendude stated
     

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