Generac Generator Dropped a Valve - Will It Run and Make Power Again?

This Generac GP6500 Generator was given away for free. According to the owner, she was running it when it abruptly shut down and locked up. A friend took it apart and discovered a valve dropped out of the head and fell into the cylinder punching a hole in the piston and destroying the head. This machine was given away for parts. Can it be rebuilt? Or should I just swap out the engine? Things were going well with the repair until the load test.

Generator Model: G0076700
Engine Rebuild Video:    • Honda Clone (GX390) Engine Rebuild - ...  

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