1999 F150 4.2 V6, Coolant mixing into the oil pan. I have replaced the Cam cover gasket and water-pump. Also the heater core and hoses. I'm still having the same problem. Could It be the lower intake gaskets?

 

Yes or the head gaskets. Worse case would be that there is a crack in the block ....but that would be extreme and only happen if the coolant was waayy below parr (like nearly all water) and it was left to sit in sub-zero temps .

Hopefully you have not continued to run it like this very much at all. Because the coolant will eat at the bearings .

 

My truck was sitting for 8 months while I was locked up came home put new tires on it new battery filled the truck up with water and water poured out of the timing cover.. So I found a hole close to the water pump on the timing cover.. Dime size oval.. But my truck was not smoking like a blown head could the water be from freeze plugs behind the timing cover