Bob, Thanks for the reply. If I use the cobra with a/c I'll have 1/2in more clearence and maybe could move the radiator forward and have room for a 1/2in. to 3/4in shrould. Just tired of spend money at having same problem. I had a fan that worked but when I call Spal for the fan controller he asked what fan you running. I told him the 16in extreme tha that pulls 3000 cfm. he told me is was good for 30 minutes max at a time and 1500 maxium hours. So how I'm run there 16in fan that pull 2360cfm. Thanks. very much Leon