There fans are 2500 true CFM, I had a problem with a 400 chevy in a model A, this is the only fan that kept it cool. I got a air flow meter and all the 3000 cfm fans I got, only flowed 1500 CFM, this fan flowed 2650.
Thanks for the input Brian. A buddy had the same issue with his stroker small block in his Duster. Spent a month researching fans and airflow and concluded these were one of the best out there. His cooling issue was immediately solved.