Hi Larry, I have never had any problem with my '37 Buick Roadmonster overheating. However, I am blessed (?) with two of the most notorious overheating cars ever made--a 1937 Cord and a 1940 LaSalle. Here's what I have learned that works. Use any or all and you'll see improvement. 1. Install a good electric fuel pump as your primary fuel pump. Avoid the AC Autopulse (and other brand clones) click-click-click-click diaphragm pump--I have experienced pinholes in the creases of the bellows, and that means that your car STOPS, always in the worst imaginable time and place. I use a rotary pump, 6 volt, easily available, lifetime warranty. I have a dash shut-off switch for it and I power it with a relay. I run it full time, and I by-passed the mechanical pump. 2. Insulate the fuel line under the hood. 3. Install sheet metal heat shields between the exhaust manifolds and the fuel line. 4. Install a 6 volt radiator fan. This really helps. I installed a dash on/off switch and powered it with a relay. They are available --->> IN SIX VOLTS !!!! <--- at Scotts Cooling Fans, 1-800-272-3267. His web site is not up yet. I stayed away from a presurized cap--I was concerned about the seals in the water pump and how much pressure they were designed to handle. Hope this helps. --Tom .