new motor-------->cooling issues ...Please Help!

[drummerboy5.0]

I just finished swapping in a new motor and I have been having a tough time keeping it cool.

With the old stock motor, i had trouble getting it to actually reach operating temperature. now it just wants to overheat.

It has plenty of coolant at a 50/50 mix, and the thermostat is installed correctly.
The electric fan runs at full capacity
I double checked the timing and it is also set properly.

The setup is as follows: 306 W/ GT40 intake, B303 Cam, underdrive pullies, 192 degree thermostat, electric fan, larger 3 row rad, other usual bolt-ons.

I really don't know what to do.. when the car runs for 5 minutes and i shut it off, i can hear the coolant boiling..
please help

 

[cobra92usa]

Tough one . . . the thermostat may be installed correctly . . . but is it functioning correctly is the question . . . that would be my first step for a simple solution, try a new stat. Maybe even go one step further and upgrade to a 160 stat for good measure. Next step . . . waterpump/belts.

 

[NeVeRLiFt]

Check the thermostat and water pump and flush the radiator.

I have seen cars run fine and have a very tiny hair line crack in the head do this.
On the same note I have seen a head gasket going out cause this.


goodluck finding the problem