I asked you some # of posts ago what type of pistons you had; cast, forged, or hyper. You never answered. If they are hyper then the .020 ring gap you mentioned somewhere above is way too tight, and the engine seizing could be the result of the top rings expanding due to heat and stopping piston travel. Most of the time this starts popping the top ring lands off but if it occurred just as you lifted off the throttle could have just seized the engine. In one of those pictures it looks like part of a top ring land has popped off.
I came back. The thing I saw is shadow so nix my comment re a ring land coming off. Is that stuff in the pan aluminum or steel/iron?
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