Radiator Shroud

Has anyone else heard of this. I purchased a new 22" radiator shroud from Mancini Racing. Install went fine. Ran the car two days and my fan blades started hitting the lower portion of the shroud. After a close look, I see the shroud has shrunk from the engine heat. The top and bottom center sections have moved inward. I started out having 3/4 inch space between fan blades and shroud. Now, the blades are hitting the shroud.

Any suggestions where I can purchase a quality schroud ?

Thanks