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You need to charge them individually.

This is what a piston looks like after it touches a valve. I guess you can't see it in the pics but, the piston is cracked near the edge and it barred over hard when the piston was at the top. In this case, an adjuster came loose and the valve touched the piston.

You can try tapping the valves with a plastic hammer, but unless it stays down this is not a great way to find it especially if you already have a bent valve(it will return but it will be lower than the others). Most likely you will need to remove the heads.

Look for a dropped or stuck valve. If a valve hit a piston, you'll need to pull the pan and look for piston damage.