Dan, don't waste your time. Take a look at the Type Certificate for the
Navion. If your heart is set on a 470, go with the IO470-C. It's almost
a drop in replacement for the E series engines, you can get parts for
them, they're on the TCDS so you won't require a form 337, and you gain
a few horsepower. Plus you can use a McCauley prop instead of the
devil-spawned abortions that Hartzell passes off as aircraft thrust
converters. Your other options are Continental IO520 and 550's, or the
Lyc. IO540. Any of them are better than what you are considering.

Rip
Navion 5186K

dan reilly wrote:
i have a 49 ryan navion w/ an E-185 engine. i got my hands on an
0-470"A" engine that i would like to put into my plane. but the problem
is that the navion is only approved for the 0-470"P" "K" "H" "M" and not
the "A" 470. is there a way to make my 0-470"A" into a 0-470"P"? i know
the "P" has a pressure carb but i think the cyl's and crank are
different. any help would be appreciated.

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