I have a vortech supercharger on a 05 DE non rev-up. i have the GTM dual pulley mod with a revised belt set up and a 3.125 pulley on it. I need to know the belt size or number for this set up? please and thank you!

 

call GTM

but best bet is to just use a piece of string to get rough measurement. Then buy 4 or 5 belts around that range and keep the one that fits the tightest with the least amount of tensioner adjustment.

 

79.5 i believe. search