All, After what I did to my finger on my flex fan the other day, I may get a shroud, or possibly better yet go Electric (boogie woogie woogie) < Old song reference What size/CFM works for you guys? Car is a Demon. 420" 360 based small block' 850 HP Holley. Eddy heads Hughes Stage 2 porting. 904 RMVB, PTC 4000 stall convertor, 4:30 gear. I'm using a good Cold Case aluminum radiator with a transmission cooler in front of it.