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as I recall you are trying to run a 22 inch rad with 3 row core, mechanical fan and no shroud.




My 69 Dart has a 22" 3 row radiator , mechanical fan but wit ha shroud. I have run it on the highway at 65mph with 3.91 gears and F70-14 tires, RPM was up over 3k, in 95 degree heat and it was fine.