At least 4 hours or more.
Replace the head gasket is the only fix.
Blown head gasket.
YES!
your head gasket is probaly blown.
blown head gasket!
I have a 1990 Mustang 5.0. I know for a fact the head gasket is blown. Every time I open the radiator there is a release of pressure. So my answer is yes.
You have a blown head gasket.
The Ford Explorer was introduced in 1991. There are no 1990 Explorers to take a transmission from.
Most likely you have a blown head gasket. It might cost you couple thousand dollars to repair it.
Burnt valve, blown head gasket, hole in piston, severely worn compression rings.
If your 1990 Lumina has gas in the oil pan, then there could be a stuck injector flooding the engine. There can also be a blown head gasket. Driving the vehicle can destroy the engine.
I would say you hit the nail right on the head.