Sort Belt?

[superchevy00]

Are any of the gm guys here running a short belt at the track. I was thinking of trying it out next weekend.
I have been doing some reading and I'm still not sure the belt pattern and length/part # for stock pullys.
Any help is appreciated :)

p.s. - I'm a moron; can someone fix my title

[GRAPHITEHEMI]

ive heard good and bad things about this, good being it gets you about .1-.2 in the 1/4 the bad is ive heard the PCM having problems because of voltage issues with no charging from the alternator. Yes i know there are voltage regulators but the pcm still doesnt see a full charge, i dont know all the stories on the GM side ive just heard those stories from the dodge guys.