In article ,
(Gene Z. Ragan) wrote:

Hi,

I am wondering if V0-435 cylinders can be used as replacements for the
original 0-290 jugs.
This is for non-certified use. I have also heard of an O-320 cylinder
modification. If anyone could give me some advice, I would greatly
appreciate it.

Thanks!

Gene

I don't know about VO-435 cylinders, but O-435 (-A, -1) straight valve
cylinders are a direct replacement for the O-290 series. They, along
with O-290 cylinders, will eventually develop cracks, either at one of
the plug holes or between the valves.

Use the 3-ring pistons, instead of the 4-ring ones. El Reno Aviation
(see Trade-A-Plane) has all kinds of O-435/O-290 parts.