Cab pressure vent??
 

Going to weld up the kick panel vents on my 68 truck, so the cab is going to be completley sealed. Was thinking about adding the 71-72 style pressure vents to the B pillers on both sides. My question is are they that criitical? Do i actually need to add those, or just role with it sealed?

Re: Cab pressure vent??
 

probably depends on how tight your cab is sealed. There are still going to be some leaks at the windows and door gaskets. But you can't push air into a closed cabin without the air already in there going somewhere else. Heating and cooling would be less effective.

Re: Cab pressure vent??
 

I remember having a 67, and unless a window was cracked, the doors were HARD to shut. So it does relieve pressure in that respect as well.