Quote:
Originally Posted by Bullockracing
Yep - head gasket developed a leak between the combustion chamber and the cooling jackets --> exhaust gas pressurized cooling system and ruptured radiator. Probably due to the heat expansion difference between the aluminum heads and iron block, but may be related to being drag raced and autocrossed occasionally... I have been religious about recurring maintenance, so I think it was an anomaly.
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If you took out the thermostat and drilled a couple of holes in it there isn't that shock from the rapid temp differences when it opens up. Mitsus had a thermostat like this in the 90s. I have always done this on my race cars and only my Mitsu powered 3.0 Sundance had the same problem (I should have drilled another hole in it) you had. I also use an electric water pump to cool down the coolant temps after runs. When you shut off a motor is when the coolant temp gets way too high.