My poor, bent intake valve. (350 4-bolt main of a 1978 Corvette)
I jumped on the accelerator and the timing chain must have had some slack. My #2 piston slapped the intake valve, denting the piston top, bending the stem, pushrod AND the cam.
We rebuilt it with better internals. Now I've got more power.

From my yard:
Peony

Hydrangea

Camelia