The blowers that I have run all pushed more air to the front of the manifold.To give you an idea on my old set up 6-71 std rotors,indy manifold,1 to1 drive on indy -13 heads the front jets were some where near 68's and the rear was 29's.The fronts were still warm and the rears cold. A little tip to help this problem is to turn the manifold backwards. It dose work with very little mods and you gain 3 5/8 setback. After that the rear started to show heat. That was only with hat nozzles (class rules)