Cutting coils does two things. It lowers the ride height, and it increases the effective spring rate (makes it stiffer). So if you want a firmer ride and lower stance, it does that.
That said, if you aren't careful, you can get the spring hot and lose it's temper, making it weaker. the best way to cut them, is (as Smakes said) either wrapping a soaked rag around the spring right where you plan to cut, or submerging it in a bucket of water up to the cut area. Basically keep it cool. Also, never use a torch to cut a spring. I find a cut-off wheel on a die grinder works best. The cut off wheels on most full size grinders are thicker, and therefore create more heat in the cut. Still, if you are careful, you can get away with the thicker wheel. Also, be conservative, if you're not sure how low you want to go, cut a half coil at a time, because once you go too far, you can't go back. The time it takes to test install the spring to check ride height is well worth not having to buy new springs and start all over.
There is no inherent safety issue with cutting your springs, any more than there would be with any suspension mod. As far as "crappy ride", I assume what you mean is stiffer, which some people like. A stiffer spring 'can' considerably improve handling, though too stiff a spring can hurt it.
BTW, my '67 Fairlane Wagon, when all was said and done, had 4 1/2 coils cut out of the front springs for a drop of almost 7". The stiffer spring rate on that heavy beast really improved the ride (no more sea sickness), and helped the handling considerably.
All this info is from someone who cuts metal for a living, and previously worked in a automotive customizing shop (me).
Originally Posted by TheStig88
i have more than 2 teeth and i don't screw the livestock...
I DON'T KNOW CHEVYS!