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Thread: Piston rings

  1. #1

    Default Piston rings

    I have a 1964 FL. I bought a set of .040 rings part #22360-53. My parts book says they are for FL but doesn’t not FLH. My problem is I believe the pistons are aftermarket FLH pistons. Does this matter? Is there any difference or did the book just fail to mention FLH?

  2. #2
    Join Date
    Jun 2005
    Location
    Northern Colorado
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    837

    Default

    The -53 FL rings do not fit factory FLH pistons. IIRC, the rings are thicker than the FLH.
    VPH-D

  3. #3
    Join Date
    Aug 2004
    Location
    Beautiful Northern New Mexico
    Posts
    2,797

    Default

    As VPH-D says, FLH pistons used 1/16" rings, Fl used 1/8 or thereabouts. The deal was longevity versus power. Thin rings sealed quickly, had less friction, but wore out faster. Thicker rings lived longer. That all changed with modern materials. Use modern thin rings and don't look back...
    Robbie Knight Amca #2736

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