Thanks Guys. Not after HP gains, just want a cool motor. Not sure of HP in my motor but it's a 540 stroker in a MP Siamese block. I have 1 1/4" from the nose of the pump to the back of the Rad. The twin electric fans with shroud is 3"s thick. What did you save in depth by going to the flowkooler pump and I guess they make a pulley to go with it? Ron