Powermaster Starting & Charging

First of all, this alternator is not a direct replacement for a factory ACDelco alternator. The belt length is about one inch longer. I was told that I could put a 10-rib pulley on it and it would still be compatible. Not so. To begin with, you need a longer belt, especially if you have a 10-rib setup. In my setup for a 2012 Camaro SS, the belt sizes in that range are very scarce. I ended up using a Gates 120964HD cut down to 10-rib. But then I found out that the pulley did not align with the other pulleys and I could not push the pulley any further onto the shaft. So to get the pulley in line with the others, I had to grind the back of the mounting lugs to get the pulley closer to the engine (LS3). This took about 4 iterations and it is still not exactly right. Given all the mounting problems, this is still a very good, well built and rugged alternator. Just be prepared to spend a lot of time getting it to fit.