Look at Van's Blather here.

"Kyle Boatright" wrote

In talking with Van's, they really thought they would have quite a few
customers for the RV-9 who would use the 0-235 or 0-290. Sure, there are
a
few, but there are far more guys bolting on the 0-360 @ 180 hp, which is
20
hp more than what Van had in mind when he designed the airplane.

I have a friend who was one of the few that chose the lower HP, then. He
built a fire breathing, race 4.3 liter Chevy RV-7, then got it done and
started almost immediately on a RV-9, which he put a 235 in.

He claims that he can go blasting around in the 235 HP Chevy when he wants
to go fast, and poke along in the O-235ci for trips, for next to nothing in
gas costs. The best of both worlds!
--
Jim in NC