I believe under slightly different circumstances (a passenger, etc.) I wouldn't
have been able to maintain altitude.

I said:
I had an exhaust valve stick open in a Cessna 150 (O-200, 4 cylinder) cruise
and it resulted in a dead miss that nothing helped. I was able to maintain
altitude at full throttle
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George commented:
My conclusion from these two occasions is that
the engine actually put out more power with ignition failure on one cylinder
than
with compression failure.