So, my 99 Deville has been doing good since it's last over heat (Jan. 2011). Just now it overheated again. I was tryna keep up with my friend (Camaro SS 6.2) before he lost me so I was hitting 108 mph. That's the first time I've been that fast. I've always blamed my head gasket because that's the main problems with N*. But I don't see no signs of Head Gasket failure. So what else can it be? I need help.

P.S. I left it at some warehouse parked because I still want to go to the cook off, that's where we were heading