You know me, I won't throw mud at someone who can't answer for themselves
As for age, I just look at that 30's cast iron as well seasoned. Rumor has it, you know, that the factory used to cast up cylinders, then throw them out back for a year or so and let them go through a couple of Wisconsin winters before bringing them in. then they machined them to size and sent them out the door.
Frankie first went together back in '92. I just rebored from .070 to .090 due to my own stupidity. Let it run low on oil.
Surprisingly, it has been very reliable. Never left me along side of the road yet.
The only thing I've avoided over the years is winding it up and dumping the clutch from a dead stop. Other than that, It's been pounded plenty.
Let's face it though, although a hot flathead, it's still only about 42-44 Hp. I guessing at this as it always ran neck and neck with my buddy's Clubman's Goldstar.
The point being, not a lot of power to feed into basically a Sporty motor.