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This thread does not apply to my naturally aspirated C337G and I do not claim to understand the dynamics that impact mags at high altitude. I can however second the previous post on spark plugs. I finally made the switch 2 months ago from Champion plugs to Tempest plugs and the improvement has been remarkable. For 18 years always purchasing Champion plugs, (for no other reason than habit) I finally made the change. Poplar Grove recently overhauling my front engine, convinced me to do it.
I have always been battling fouled plugs and I have read many articles on the resistance issues in Champion plugs that apparently Tempest plugs do not suffer. After 30 plus hours now of operating with the Tempest plugs, my freshly overhauled front engine, and my 32 year old SFRM and 300+ hour past TBO rear engine have been purring perfectly with not one single fouled plug or plug misfire at anytime. I find the improvement amazing.
Good luck with the resolution to your issue.
Ed
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