Had my '72 LeMans out this weekend in 90ºF weather and it would run at 170ºF cruising and 180 idling at a light. I have the stock 3 core radiator with the water pump clearanced and a 7 blade flex fan. It used to go uo over 200 with a Hayden severe duty clutch and factory 7 blade fan. I use a 160ºF high flow T-stat.
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