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It never gets hot at idle, even when it's 109 like yesterday. However, at 70 mph turning 3200 rpm, it gets quite warm. New radiator, electric fan, new motor (.030), etc. I've already heat-insulated the headers and checked timing. My Ford genius buddy suggested an H or X-pipe. Any other ideas would be appreciated!
 

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Sounds like the thermostat isn't working
 

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I agree with the above...

It's also POSSIBLE that your fans are turning off for some reason while you're driving...
 

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Lean mixture, retarded timing and/or detonation come to mind. What do the plugs say?

Verify function of t-stat in boiling water. Try running a 160 degree t-stat and note any differences.

Get back to us....
 

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Maybe you are too advanced, I had the same problem brought it back to 8 degrees and it fixed the problem
 

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Do you hear ANY pinging at all? (Sounds like a chain dragging underneath your car.)
 
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