How hard is it to convert a gas dryer and stove to propane? I understand you have to change the orifice , but I am not sure as were they are located is in the gas valve ???
The orifices, at least in most stoves, are at the burners - including the oven and broiler. You then convert the regulator and set the "low" position on the gas valves.
You can get a conversion kit for your model at most parts stores. They aren't usually that expensive and have everything you need and best of all, directions.
You will need a kit to change the orifices for going from Nat to LP.
You will usually find the orifices at the end of the burner by the primary air intake. Make, model and serial number will definitely help tracking down on directions.
My new natural gas furnace came with a conversion kit to change to propane. There were new orifices as stated. I also had to borrow a manometer and adjust the regulator while the furnance was running.