At least 4 hours or more.
Replace the head gasket is the only fix.
YES!
Blown head gasket.
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.
Burnt valve, blown head gasket, hole in piston, severely worn compression rings.
Most likely you have a blown head gasket. It might cost you couple thousand dollars to repair it.
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.