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Old 11-15-2002 | 04:32 PM
  #10  
Dave Shadel
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From: Gardnerville, NV
Default Y.S. Piston Gas Port Modification
We started doing this in all production engines late last year. I doubt your 91AC has the mod, but if it is running OK, I would not worry about doing it until it's time for a rebuild.

Good Flying,
Dave
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