toronado coolant problem
 

i have a 85 Oldsmobile Toronado with a 307 that overflows with coolant through the reservoir as soon as it gets to operating temperature. Could this be a head gasket problem?

Yes it could for sure. Does it get worse if you floor it?

not sure, i usually shut it off when it starts overflowing

It could be as simple as the thermostat being stuck closed as well. Start there and if that doesn't fix it you have deeper problems.