Anyone have or know of someone that has a 337 to install C-90-16 in a PA-11. TCDS says C-90-16 is the same as C-90-12 except that -16 case has provision for vacuum pump. The C-90-12 is the same as the C-90-8 which is listed as an approved engine for the PA-11. Cub Doctor says you would just need to attach a block off plate where vacuum pump would go. Trying to make this a legal install without going through the hassle of trying to get it approved by those without any common sense.
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