How hot can aluminum heads get before they warp?

[sydhawk]

Do not run the car without a therm.You didn't say if you had a cooling system on the car or not.If you don't get one.You need a seperator tank and at least a three core rad.The tank will remove air from the system.Air is the biggest culprit of high heat problems.It will hook up to the bottom rad hose.It must be {the tank}located higher then the rad.Strut tower by the coil works.