The fans are pullers and the mount right on top of the rad and the cover all but the top two inches. don't know the cfm for sure. the fans are dual fan in one mount next to each other. I do know the pull about 9.5 amps a piece. the fans mount has a rubber strip around the body next to the rad. go to try the open headers and then try to put the flex fan back in to see what happens.
