grand prix overheating

i am at witts end with this car i have the 3.1 3100 just replaced the water pump, thermostat. heater core and i replaced the intake gaskets twice and this thing still wants to get hot gets hot then rods start chattering then it dies i can not figure this thing out

Has the cooling system been flushed? Is there air in the cooling system that needs to be blead out? Is the head gasket blown? (stupid question) but is the t-stat in in the correct direction? Do the cooling fans turn on?

yeah, i would say head gasket. 3100's are known for em'.

It also sounds to me like you have blown out a headgasket from the combustion chamber into the water jacket.

This will boil the coolant internally (~800 psi peak cylinder pressure vs. 50 psi maximum pressure in the water jacket).

Also keep in mind a 3100 has iron block and aluminum heads which tend to "scrub" the head gasket into failure (over a long period of time) due to the different expansion rates of the metals.

I'll add myself to the list of people that believe you have a blown head gasket.

ok guys thanks alot looks like a tear down is the ticket thanks again