I was at the GTOAA National Convention on Friday hoping to get a definitive answer on this question: What's the guideline or determining factor for having a fan shroud vs. only having a fan guard? A month ago, someone told me only cars that had AC were equipped with fan shrouds. At the Convention, I saw all types of combinations. Non-AC cars had the shrouds. Some AC cars had the shrouds but some only had the metal guards above the radiators. What was Pontiac's guideline for installing the shrouds and guards?