I recall reading that if an AM radio is tuned to frequency x plus or minus the heterodyne frequency a radio tuned to frequency x will be blotted out. Is this true? If so what is the heterodyne frequency? Will it work with FM?
If you're speaking purely about receiving rigs, POSSIBLY... (but probably only under very specific conditions) for a TX/RX rig, the situation changes drastically.
I'm quite sure you'll find that varies from radio model to radio model. There's nothing "magic" about it - It's just the frequency the designers picked for the heterodyning process. In theory, it could be any frequency the designers care to choose. In practice, there are some limitations (imposed by both the laws of physics, and the available parts to build the beast) on what frequencies can be used with a given reception frequency range to get decent results.
See first answer.
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My brain cells work OK when applied to matters I know something about. I doubt that your brain cells would be much use in dealing with matters that I know something about however well they may work in relation to matters you know something about. e.g. I imagine that all you know about proving up uranium ore reserves in sedimentary rocks could be writ large on the back of postage stamp.