Old Engine = Runout Engine ?

[KyleTownsend]

I am in prebuy on a 71 F model. The engines are mid time (700/900), but haven't been overhauled since the late 70's (meaning the plane hasn't flown a whole lot, especially in the past 5 years).

According to Continental, this makes them "run-out" and due for overhaul. I am wondering how much concern you guys would have about the age of the engines, and what you would look for in order to determine their health. Assuming they check out OK, how much value would you put on them in comparison to similar-time engines that had been overhuled in the past 10 years?

At this point, I am having borescope, compression tests, and oil analysis done.

I have already determined that the engines don't have the VAR cranks, and one probably has the narrow pushrods.

Thanks,

Kyle Townsend