For the reasons Fish and Koop just stated, this is the whole reason it is important to choose the right pump for your system. With the SSIC my flojet did what it was designed to, and was matched well for the core, lines and radiator size. When you are getting a much larger radiator and core, as well as moving up to 3/4" lines you are definitely going to need the extra flow to compensate for that. I was looking into that IC controller as well (Fish it looks like we are going towards the same setup) I just need to decide on a pump. Is there more than one GM pump? Someone mentioned one for $110, but buying from zzp it runs something like $140.
