I purchased a 99 miata with a "seized" engine for $700 recently. Ends up the engine turns just fine, but the exhaust cam tried to take a vacation. In its escape attempt, it over extended a valve on the #1 cylinder causing the damage in the pic. I'm pretty sure what I'm going to hear is "Any damage to a piston is too much damage", but I wanted a sanity check before I pull the engine and replace all the pistons.