Jim Macklin wrote:

Start with the throttle 1/2 open, zero rpm to 1800 with no
oil pressure. Etc.



No, I don't start mine like that. On shut down, I set the throttle for
1000 RPM and lock it. The throttle doesn't move again until the engine
is warmed up. I preheat religiously below 30F, and I don't leave the
preheater plugged in.

Also, if it were corrosion that got mine, why only one cam lobe?? My
mechanic tells me there have been a rash of problems with newer cams
with flaws in the case hardening. I haven't seen evidence to prove it
though.