Andy,
At least you had the tool at hand.
See … I told you.
The piston must have the exact correct shape to help close the valve without bending it.
Just to be sure, do a cylinder leak test.
A spec of rust is the usual staring point for a fracture.
The intake (top) part of the cam box gets more moisture (cooler) and gets less oil.
I suspect these are contributing factors for intakes breaking more often.
It was good to see you last month.
Best,
Grady