Now it is time to get the electric fan mounted to the radiator. I always start by using a piece of 1/8th by 1 inch wide flat bar and then mount it to the grill shell mounting tabs on the radiator. The holes are drilled and tapped 1/4 -20 in the flat bar and 1/4 inch holes drilled in the aluminum mounting tabs. The expansion tank ( overflow ) is then mounted using 1/4 -20 holes drilled and tapped in the flat bar.
Depending on which radiator manufacturer I use and which fan is selected, will determine how the brackets will be made to mount the fan to the 1/8th inch flat bar on the sides. This one worked out quite well and only required a hole on one end - drilled and tapped 1/4 -20 and an angle cut on the other. I weld both on the top and inside the bracket so that the outside can be radiused and still have lots of strength from the inside. This is done with all four mounting brackets and with the supplied hold down that comes with the fan, bolted together with a 1/4 - 20 bolt. Final assembly will use blue lock tight and an SAE 1/4 flat washer.
This is another shot showing the right side mount.
Here is a standup shot with the flat bar and expansion tank - overflow tank, in position. These are pretty straight forward and come together very nicely. I usually finish the mounting bracket with urethane primer , glazing putty, and final color to make them look more professional. You could also use spray can gloss black and it would also look ok. It’s all about personal choice. The two drilled and tapped holes showing, in the flat bar, are for mounting the grill shell to the radiator.