No Hoper.
This is an engineering discussion. 20000 pounds is not a force it is mass or weight relatively speaking
I am certainly not an engineer.
I think Walter said roughly 20000 lbs of force is applied to the threads as a result of combustion?
You said,
Where did the 20000 psi come from?
Why did you misquote him?
Correct me again if I am wrong, but I think combustion results in a force being applied to something, be it pistons or whatever?