These tabs and the pegs and the bottom of the radiator go into the OEM rubber mounts on the core support. The bosses on the front of the radiator are for the AC condenser.
The internal construction of the CSF radiators core has some innovative features. One of these is the B-Fin tube. On a conventional radiator, there are rows of oval-shaped tubes. Factory radiators usually have two rows and aftermarket radiators have as many as 4. This gives more cooling area but the air has a problem penetrating the core and doing heat exchange. The CSF core has one big tube in a single row. CSF calls this their B tube. The B Tube starts off as a sheet of aluminum that is folded back onto itself to form a B shape to the desired width. After forming the seam of the tube is furnaced brazed to make it one piece and leak-free. The B-Tube gives the ideal ratio of fluid to air exposure with the center B piller giving strength and an additional conduction path for heat to follow from the fluid to the outside of the tube. The one-piece construction also makes it easy for air to penetrate the core, helping with heat exchange and cooling.
In-between the B fin tubes are these heat-conducting turbulators. These provide a path for heat out of the tubes to the airstream in radiators. Another innovation from CSF is that the turbulators are louvered. This helps improve airflow through the core and helps improve heat exchange efficiency. You can see the louvers here.
To install the radiator we first drained the coolant.
We then removed the upper radiator flow guide. This is the guide that directs air out of the radiator and out the top of the hood. This is part of the C7’s great aerodynamics.
A couple of bolts and it comes right out.