Have those fans prove them self in the past? Like keeping a previous motor well into a happy temperature range? I had dual 12-inch fans that really didn't cut the mustard very well and I ended up putting one very good 16-inch fan in and now all is well...
You remember what cfm was that electric fan? Cause I ordered a cold case Aluminum radiator And I’m about to order the fan shroud with it which is a single 16inch electric fan rated at 2500 cfm
