The ’59 rod bushings are extended out of the rods slightly more than the earlier ones. This was probably done to try and keep bushing wear to a minimum before they switched to needles on the pins. If the rod bushings are worn, replacements can be made and fitted to the pin.
With worn bushings, you’d hear it before you felt it. Any bad vibration is probably from a bent prop blade. A later 9.5 prop will fit right on.
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