Now that summer is on it's way, I am thinking about making additional improvements to my TBird's cooling system. I already have an aluminum radiator and electric fan.  Made a big difference.  There are a number of additional modification available. Casco sells a water pump with deeper fins.  I believe this is to compensate for the TBird spacer.  They also make a smaller water pump pully which is supposed to improve flow at idle.  I have also seen an improved spacer. My issue is only when sitting in traffic on a hot day.   As soon as I move, the temp returns to normal. Any input?

Thanks for the input.  My TBird has a manual transmission with OD and 4.11 gears. At 60 mph, I turn about 2,200 RPM in 3rd gear OD.  My car also has a 170 degree thermostat. I never turn my engine over 5,000 RPM.   It stays at 170-180 degrees whenever it's moving. In the summer sitting in a traffic jam or waiting in line, the temp creeps up.  So far it has not boiled over.  Casco wants $140 including freight for their pulley.  I bought one from Summit for $50.  If that doesn't do the job, I'll look into the improved spacer.

As I remember I had to use a shorter fan belt; the generator at that time didn’t have enough movement. I hope it works for as it did for me. At 2200 I’m right at 65 now and can run over 70 and like the lower rpm keeping up with highway traffic and still hearing the radio.

56 Vic, B'Ville 200 MPH Club Member, So Cal.