Made an adjustable grill block to go with the new air dam. Made them from coroplast as I had scraps left over from the sheet of coroplast.
The idea is to have an adjustable grill block so when you need more or less air traveling through yer grill...you can adjust that from the inside of the truck.
First I built the slats fer the top and second row in the grill. I thought about making one fer the bottom slot but figured that I would still need that regardless of what the temp was. That may change in the future.
I made the slats 2" deep and made notches in the back to accomodate the grill supports. I have them taped in place with some clear packing tape but I'll move to something more permanent once I git my other supplies figured out. Fer now, I'm gonna tape them in the open mode while I'm trotting around town. As I go fer the long drive, I'll tape the top row in the closed mode fer the day and then the 2nd row will git taped down fer the night drive.
Here's the first row with the tapered edge in prototype white!
2nd row added
I painted them black so they wouldn't be as prominent. With the coroplast in the horizontal (open) mode, it blends in nicely with the grill and it's barely noticeable.
Both rows closed
Both rows open
Top view

Side view