Oven gas will not flow with pilot lit

There are basically two types of ranges to deal with:



those with sealed top burners, which are pretty much the standard today, and the conventional, 'non-sealed' ones.
While they operate in much the same way, their conversion is usually different. There are still a few ranges that use adjustable sealed burner orifices, but most are 'fixed' and must be individually replaced to convert each burner from one fuel to another.

(An orifice is simply a small brass fitting with a specifically sized hole very accurately drilled through it, and, if adjustable, has a provision to change the size of this hole by turning closed a threaded portion).
Either way, basically what you're doing when going from natural gas to LP is changing to a smaller orifice to allow for the higher pressure supplied by the 'bottled' gas (The available energy in each ft of gas is different too, but for our purpose here that's not important). Natural gas supplies typically run around a pressure of 5.5 inches water column, while LP runs at twice that pressure, averaging around 11 inches.

The orifice through which the gas travels to the burner must be smaller to accommodate this difference.
Adjustable orifices are simply 'snugged' down, clockwise, with a 1/2 inch open-end wrench, to convert them. Nearly all oven burners use these too - more about that in a minute.
Fixed orifices are replaced, and the good news is: the LP parts are usually included with the new range. On some brands (GE being one), the unused set is attached to a storage point on the stove, and this is a great idea. This way, they can't get lost, and if you ever want to convert back, there they are!
The not-so-good news: these little top burner orifices very often require a metric wrench to remove & install. And some can't be changed without a very slender wrench or nut driver.

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