GT500Tow Posted January 3, 2011 Report Share Posted January 3, 2011 FYI, If any of you want a 2.5 upper pulley. You can use a belt sander to sand off the material needed to install a 2.5 pulley. It only takes a few minutes once the blower nose is off. Your removing 1/16 of an inch of material from each side of the nose..Tape it up good with masking tape before you start. So no dust gets inside of the blower drive gear housing. Pressed on pulleys really need to be pinned. Or at least install a bolt in the center of the pulley shaft. Especially if your running small upper pulley and 10% lower pulley. I've always wounder why it didn't have a what i would call a safety bolt in it from the beginning. I know the Lightnings and tems did. I've been runing a 2.5 upper for a while. No problems so far and my car has many 1/4 mile runs on it. No belt slip at all. I also don't run a belt tensioner of any kind. 2.5 pulley cost is 150. You'll need supercharger oil. Ether buy two bottles or you can use 50W redline racing motor oil. So a 2.5 isn't expensive to install and can be done in two hours. Great mod for a stock blower. Link to comment Share on other sites More sharing options...
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