how can un-warp old guitar neck

I was given an old suzuki acoustic guitar. Its probably 30 yrs old and has been stored with the strings tight. This has warped the neck slightly raising the strings off the frets to make it somewhat difficult to play.

Can I apply reverse pressure for a years or so to make it bend back? The guitar looks to have a steel rod in the neck but it seems pretty tight already.

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Why not go for broke and attempt to adjust the truss rod, if it is adjustable?

Yes, reverse pressure would work, if you have a few years. It is probably the least destructive technique that you could use. Knowing how much to overbend the neck will be the hard part to calculate.

If it is a high quality instrument, it might be worth contacting a luthier to see what they might say. If not, and I imagine that is why you are asking

involves a lot of work.

Ammonia vapor will loosen the lignin, the binder that holds the wood fibers together, and will permit you to reshape the neck. It must be held in a jig until the lignin resets. Naturally, if the truss rod is adjustable, but at its limit, it must be reset to a less stressed position.

Also, any other wood and glue joints must be protected from the ammonia vapor. In order for the ammonia vapor to penetrate the wood, any finish on the affected areas of the neck must be removed and then reapplied once the task is complete.

As I said, it involves a lot of work. But it can be done.