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What about a broken valve spring or springs?
My old engine was running hot. I sold it to T77911S after rebuilding a spare engine. He found a broken spring.
Just a thought.
Also, I feel that headers without heat exchangers create more heat on the bottom of the engine. For example, I put SSIs on my new engine but used block off plates prior to backdating my heater. Temps were MUCH higher with this setup. Once I got air running through the exchangers I probably saw a 15 degree drop in temps.
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