I know that the 37BY is FAA approved for your small Continental engine.

--
Cy Galley, TC - Chair, Emergency Aircraft Repair, Oshkosh
Editor, EAA Safety Programs
or

Always looking for articles for Sport Pilot

"Michael Horowitz" wrote in message
...
I'm told the 37BY is shorter and runs cooler then the 40E. The 40E's
are installed in a certified a/c.
Would an IA object to me changing to the 37BYs (I need the shorter
length), and what effect will I see on performance? - Mike