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What front end problems? Are you saying the dealer won't cover a shock, steering gear, etc., or just a condition that could have been caused by the cranking of the torsion bar?
If I were a dealer, and you came in with a front end noise, and the front had been cranked up, I would inform you that if the repair is due to your cranking the rod, you would pay. If caused by a warrantied item. GM will pay.

Let's face reality. GM, or any other manufacturer, warranties the vehicle as it is when it leaves the factory, for what the vehicle is designed to do when driven. If you perform any modifications to the vehicle, that might cause a secondary problem, then why should GM pays for the repair! However, due to some Federal Regs, one of which is the M/M act, GM would have to prove the modification caused the problem.

If you off-road a Corvette, GM won't pay for an axle damaged due to crawling rocks, if you off-road a H3, GM better pay for a blown axle...get the idea.