lost a piece of piston...Stumped?

Well it was a slow moving day I didn't get much done on it, took me awhile to pull the motor by myself and I got a late start. So I just barely got the engine on a stand before calling it quits.

But we measured bore and it measure out to be 4.60. Will have the pistons out tomorrow, sorry for this taking so long :(

Also a good thing this happened cause look what I found on the cam.....

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That looks like Valve Bounce damage. Lifter smashing into the cam when the valves FLOAT! Lol haaaa