[RICK LAKE]

f16n Sorry for all the info but this is what alot of guys have gone through with over heating problems. Pat also brings up a point, head gaskets, It is real easy to mount one unside down. They will go on either way and look fine. It takes a long time for the motor to over heat, about 1 hour. It will go into the 220f and stand there. How many miles are on this motor? Is it possible that it's had alot of hard abuse? Some guys had had problems with the motor running hot from the short hose going from the intake manifold back to the water pump. Too much hot coolant goes right back into the motor and not cycled through the radiator. It's a 1/2" or 5/8" hose. Block this off and see if the coolant is running more stable. The one thing that I do have on my motor is a bigger thermostat off a Dodge BB motor. The diameter is alot larger for flow. I had to custom it with a spacer to fit behind the tank. Do you have a small hole in the thermostat for air bubbles. It's a bleed hole. 1/8" with it mounted on the top. Your Edelbrock water pump has the plate for the impellor for high flow. You don't have to check this. See if you can make a coolant pressure tester and mount it on the windshield and go for a drive. This will show you who much pressure you system is running. I have a 14 psi cap on my car and the pressure when I check it didn't reach but 8-9 psi under hard driving. You will find the answer, it's always something simple. Just finding it is a pain in the @$$#%^&*&^%. Rick