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87mm

  1. J

    TR2/3/3A Hastings Piston Ring End Gap Issue

    I'm current working on rebuilding my 3A engine, which was originally rebuilt 15 years ago and sat after only about 5-hours of run-time. The previous rebuild used a new 87mm County piston/liner kit with Grant rings. For this rebuild, I decided to use the same liners/pistons/rings due to there...
  2. J

    TR2/3/3A 83 to 87mm Piston Considerations

    When going from 83 to 87mm pistons, what modifications (if any) are required in parallel to ensure a good running engine? I would like to keep the intake manifold original and not chamfer or port the head, but am concerned this might be too restrictive for the increased capacity. I understand...
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