Quote:
Originally Posted by "QUICK-SILVER"
Ignition timing will make these cars run hotter than normal, 220°F-230°F range: Base timing too low, sticky or froze up centrifical advance or bad vacuum advance and temps will climb no matter what you do to the cooling system.
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I'd be checking out the timing,etc. BEFORE tossing 2 year old coolant.
You can get away with ALOT more intial timing on a smog (low compression) Pontiac V8
Just keep advancing it in 2 degree increments until it starts to detonate underload going up a hill. Then back it off 2 degrees & you should be in the "sweet spot"
As quicksilver says,retarded timig will make them run hot.
How old is your timing chain?