Dead hole. What’s the next step

Quick update as I ran out to the shed since it’s bothering me:
(Aj. Thanks. Will do that. Saw your post when I came back in)
No visible damage to top of piston no foreign material with borescope
Put air to cylinder. Fan moved a little bit confused me
Air came out of carb. Said oh **** but realized valve wasn’t completely closed
Removed rocker shaft to ensure no pressure
I could hear air in the cylinder. Face to carb nothing
Removed exhaust pipe/muffler Hand over exhaust manifold. Nothing felt
Pulled dipstick. Nothing felt
Pulled breather. Nothing felt
Popped rad cap. No bubbles.
I’ll try aj’s tip. Then I’ll take video to show the air sound in engine/cylinder on friday
**I did not note what air pressure the line was at. Will make sure it’s at 80 Friday

stay tuned. And MANY thanks