The fact that it won’t cool on the highway leads me to believe it’s airflow related. Or lack of…
How is the airflow OUT of the engine compartment?
Do you have a front spoiler? A front spoiler can lower the pressure under the car and allow more engine compartment air to escape under the car.
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1966 Chevelle with 217 ci, 4 cam V6, 6 speed auto, full Hotchkis suspension, Wilwood discs all around. Built for smooth, quiet handling and max MPG.
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