I recently purchased a 1992 f150 4x4 with a 302. Pcv valves are usually on the intake, but I couldnt find it, I checked the manual and it said it should be on the top left hand corner of the intake manifold. But its not there??

 

It might be in the rear of the intake under the upper intake.

 

I had hard time finding mine, a '90 with 302. It was in the very rear of the passenger side valve cover, hidden under the upper intake. You have to stoop down at just the right angle to see it. Even in daylight I almost need a flashlight.
It's right on top of the valve cover, just all the way back, almost against the firewall.
Well, at least on my '90.

 

thats also where it is on my '94 302

 

that it should be if its efi like mine it should run from the back of the upper intake towards the pass side about 3 or 4 inchs to the valve cover and walla you there