Engine Id

[wzenheimer]

Can anyone tell me what engine this is?

 

[N941WR]

Based on the age, I'm guessing here...

Lycoming O-145 of 65 hp?

Scratch that, the O-145 had the lifter tubes on the bottom of the cylinders.

I could be an O-235 or O-290. The O-235 was first introduced in 1940 and the O-290 around 1942.

 

[92ndwest]

O-235

-15 is an O-235. Case was cast in 1946.