How hot can aluminum heads get before they warp?

[Stang_ROTY]

I ried it again without a thermostat today and the engine started to heat up after about 15 minutes. I'm really starting to think that these dudes from edelbrock lie, or the pulley's I got from MARCH are straight drag racing??
Anyway, I get home and park the car on a decline with the front end pointing down. That's how the driveway is designed. 2 minutes into shutoff I blow a brand new thermostat gasket I installed. So I remove the radiator cap with a towel protecting my hands and some hot coolant come up. THEN all of a sudden the MOROSO reservoir decides to kick in and dumps a little rad. fluid and some dirt out the release valve. This sucks. It's my b-day and I can' even enjoy my car, I'm willing to met a bet that my engine builder screwed something up with the gakets.