Tim,
I don't have access to high res photos, so it is difficult for me to see much fine detail. I don't really understand your statement regarding the pushrod tube having to be twisted , flattened, or bent to align with the tappet hole. If you have a bent pushrod and /or pushrod housing tube you have problems....most likely a sticky or stuck exhaust valve. Looking at the wasp radial, the pushrods/housings appear to be at a slant from the crankcase to the cylinder jug,.... ( only natural with this engine design), accually they are relatively straight ( as the hands of a clock pointing to whatever time it may be) ...in addition the ball on the ends of the pushrod could accomodate for any slight angle, with no bending of the rod or it's housing. I am unfamiliar as to the material this pushrod housing is made from, however I can't imagine it would be a very heavy guage, thus one might expect bending and flattening,and twisting, considering the force required to separate it from it's position (crankcase to cylinder jug). And yes, degradation.
Viewing your second attachment, You note what you believe to be housing, next to the valve, ....oh, if there were only cylinder cooling fins visible on that chunk of whatever it is.