The previous post did not post in a format that is easy to read. Anyone know the model number of our SC? It seems they are very efficient and are capable of high rpm's depending on the model. It seems the smaller the SC displacement the higher it will rev. If someone can post it in a more legible format that would be nice. Also our SC part number would allow a search that would be more accurate to our unit and whether stacking pulleys is safe or not. Thanks, Mark