The first valve seat snapped off, and bounced around in the cylinder till it went sideways and crushed the spark plug and went threw the piston. The rest of the intake valves smashed into the top of the pistons but the rest didnt break. i can tell because the pistons on the left hand side are deeply indented. How the rest of the valves didnt break with indentations that deep amazes me, that only 1 valve broke. I belive the reason that the valve broke on number 1 cyl was a conjunction of other problems with that valve and or parts attached or guiding that valve. My timing was WAAyyyy off on my car because It felt like I was driving a smart car.