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Larry,
Not all P337s or T337s have pressurized mags. Rileys all do, but other than that, I would say most do not. If you do proper magneto maintenance at every annual, you don't need pressurized mags, although I think they are a good idea.
The source of the pressurization is the turbo, so on your bird, you can't get pressurized mags anyway.
I flew my '65 337 as high as 16,000 feet without a problem.
Rock on.
Kevin
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