V6 3.8L 3800
Was experiencing overheating issues and avoided operating the vehicle until I replaced the thermostat. Took it out for a drive and everything was looking good until a spike in heat after about 10 highway miles. Parked the vehicle and let the car cool off for a few hours. Tried to make the trip back home but immediately overheated so bad the car stalled out.
Had the vehicle towed and a few days later watched the vehicle at idle and no overheating but some high temps. Was getting some white smoke off the bay by the firewall at the back of the engine so chalked it up to a bad head gasket.
Removed the intake, exhaust, and both heads with no definite sign of gasket failure. Found a lot of oil in the upper intake manifold and oil in 2 of the cylinders. Need to inspect the heads for warpage but wondering if the heads may be fine and the issues could be due to intake and/or intake gasket failure?