[ronald scott56]

my 660 is pushing coolant out of the radiator i raised the frontend off the floor about 1ft, and purged the air out.When i start the motor with the
radiator cap off its pushing coolant out of the radiator

 

[fz1dave]

Put the cap back on.

 

[#40Fan]

Likely a blown head gasket. What does your oil look like?

 

[My427stang]

Water expands when hot, so if you are overfilling that could happen as it gets hot

However, if it's pushing bubbles or steady sort of violence, it's likely compression pushing past the head gasket. Any milk in oil?

 

[Devil_dogE5]

Take your radiator off and see if it’s all plugged up with dirt debris and such. Wash it out