Don't know the exact relationship between overheating and blown head gaskets, but here is what I experienced.

My car overheated 7/29/03, 122,500k, (broken thermostat) and the first hint of oil in the overflow tank appeared in mid October, 124,750k.

The gasket may have been on its way and the overheating may have been the last straw, who knows.

Monitor your oil and coolant comsumption and check your overflow tank and oil often.

glenmore
1991 300CE