You said the fan is 2" from radiator with shroud completely around it?
Im not familiar with older GTO's but on most other cars and 2nd gen firebirds, the fan isnt that close to the rad, more like ~6" away & the fan should be part way out of the shroud, about half way in with part of the blades exposed. If the fan isnt positioned right in/out of shroud it wont pull air as designed.
Also read the flow kooler pumps arent as good on pontiacs as a good quality pump with cast impeller since they have a sheet metal ring welded to cut down impellers, consider getting a good OEM type pump, I use aluminum pumps with full impellers clearanced
tight to the plate.
What radiator? If you dont have one, maybe a good aluminum radiator would be a good idea to help with temps?
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