I'm glad I read these posts as I had cooling problems when I first got my 69 Firebird 350 about 5 years ago. It was abused - after a new stock type rad (old one came apart because rubber isolation nuts were not used), 4 blade stock fan was replaced with a 5 blade clutch fan (just to be safe) and a OEM shroud was put in (as it was missing). It always runs 160-180 now with a 180 stat, as I think I still have cast impeller style water pump. I was looking to get a spare water pump, just to be on the safe side. Now I know a cast one will be a safer bet when I go shopping & will watch for that gap when it needs to go in! Thanks guys.
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Wally
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