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Frequently, when parts warm up, they expand. I believe there is a TSB about this specifically for SVXs. There are tons of little felt pads in the dash to prevent noises from the console heating up and expanding. Sometimes the pads come loose, sometimes more need to be added.
As I recall, the TSB suggests removing the dash, installing a handful of felt pads, and checking a few that come installed from the factory. Without knowing exactly what the ticking sounds like, I couldn't venture a better guess about what's causing it. The same effect can happen to exhaust systems and the neighboring heat shields. For the exhaust, tighten everything and check clearances as immortal_suby suggests.
If this happens somewhat regularly, try using a mechanics stethoscope or a piece of hose in your ear. This works wonders for locating strange noises.
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