The engine is a 470 cubic inch engine. It's the predecessor to the O-470
engine.
Some of these can have 205hp take off power.
Certain models of this engine are easily modified to 225hp engines.
This is the standard engine from the early model Bonanzas and Navions.
There is also a STC out there to get 260hp from this engine. It uses
IO-470N cylinders and spins the prop faster.

Hope this helps
Dave

Philippe wrote:
Hello,

who knows how cubic inches for this engine?

Am I true with 185HP for take off ?

Thanks