Hmmm, the symptom you are experiencing seems to point to an air pocket. Also, dont rule out that the new temp sensor could also be faulty. I have had new GM parts bad right out of the box. Do you still have the old one to maybe swap and compare? I still think jacking the car up a few inches, and craking the bleeder screws will help, as it can be a pain to get some of the air pockets out. I wouldnt worry about the uncoated headers throwing it off, the cast iron exhaust manifolds Im sure get wayyyy hotter.
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Nick
97 Camaro SS, M6, Artic White, t top.
396, AFR 210's, single plane, Strange 12 bolt.
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