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I have a 1969 T337D, non pressurized and no pressurized mags. I have tempest fine wire plugs and GAMI injectors. I have also replaced all the ignition wiring and rebuilt the magnetos. The airplane flys nicely LOP with this setup. I occasionally have experienced bumps when operating at altitude above about 17K LOP. The highest I have flown it is 21K and it was the same experience, occasional ignition bumps, but not rough operation. I have found going to ROP stops this. You don't mention if you are running LOP or ROP but you might want to see how this effects the performance.
Last edited by B2C2 : 02-01-21 at 07:31 PM.
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