This is an excellent picture to explain how a door can be sprung. The kick panel and lower cowl are not in place. All that remains is the door post that holds the hinge. Notice how thin the metal is compared to the hinge. If you have a rusted door hinge you can easily bend this metal if you force the door to open or close. It's a weakness in GM's design. The door pocket needs better support.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
