Installed 350 Crate eng. w/vortec heads, this project is a 46 Ford with Afco Rad. built for the 46 running Cooling Tech fan with shroud and smaller fan on face of A/C coil, both fans are pulling air in right direction.  Normal running temp stays around 180 to 190, on 90 deg. days in traffic stop and go it will jump to 220 + at which time it starts to burp.

I have ZZ4 Crate in 57 Chevy never had a problem just wonder it the Vortec is a problem?