lot's of discussion in the 80 tech section if you look around, but basically the foam around the radiator ensures the most air possible flows THROUGH the radiator and not around it. Foam is the extra bit that helps out the fan shroud. Also should bump up the CST of the fluid in the fan clutch so that it spins more when unlocked (good for slow speeds!)
edit: I should have elaborated.
Radiator Foam Liner
I pulled the pieces of foam that lines the old radiator. How do I get it to stick to the new radiator or do I get a new one? The plastic liner of the foam is gone so I guess I need to get some new foam with stick. What will stick and handle the change in temp?
forum.ih8mud.com
Curious as to what you mean by foam.
edit: I should have elaborated.
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