Long post, please bear with me...

I over heated twice and blew two headgaskets this weekend at Barber.

The first occurred Friday during the final practice session.
The car ran cool (180+/-) and well until the cool-down lap.
From the cool down lap to the paddock, the temp went to 240-260.
(I lost an alternator belt earlier in the day and thought the fan probably quit.)
Replaced the belt.

Cranked up Saturday morning to go to qualifying grid to discover the distinct sound of a leaking head gasket.
Pulled the head and #2 and #3 had water in them.
Dried cylinders and replaced the head gasket. Oil and plugs looked very good.

Car ran very well during a 15 lap race on Saturday
Temps on the straights would drop to 160+/-.
(This makes me think the water pump was working and the system had plenty of water.)
On the cool-down lap, same as before, temps shot up to the 240-260 range and it dies when I got back to paddock.
It would not start up.
I ran compression check on the motor:
1-120 lbs
2-30 lbs
3-30-lbs
4-121 lbs
I now supect a warped head.

On a side note, the upper timing cover melted around its bolts to the point where the plastic dripped.

Finally (If I haven't bored you) my question is:

What could be causing the overheating?
Especially the heat around the timing cover???

Thanks,

Todd