cooling question

mullinax95 said

"A four cylinder engine requires 1600 cfm; a six cylinder engine requires 2,000 cfm, a small V-8 engine requires 3,000 cfm and large V-8 engines require 4500+ cfm."

That's the same rule I went by when ordering. In your case (416 cubic inch) 4500+ might be the class you need fall in. I don't understand why it runs same while going down the interstate. Any type of fan is out of the equation when you are moving that fast.

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Nice setup there Mullinax.

Another vote to switch the fan & thermostat.

Definitely get a 180 thermostat for starters. Opening at 195, it will hit 200 easily. I'm puzzled by the highway temps too, except a flex fan will flatten out. Airflow should be enough on the highway to cool it. In heavy traffic & hot day I can see it running and extra 10 degress =205. Oh make sure the bottom rad hose is not flattening, should be a spring in it.