How do you install a fan shroud on a 71 Pontiac lemans?

If it's new, you may have to cut it to fit.

You don't need to remove the fan to install it, just slide it in between the fan and the radiator. It will be a very tight fit, just go slow. Once it's in, you will need to install the 4 bolts on the top, and 2 on the bottom.