David when i took off my old pulley there was what looked like a spacer came off on the inside of the snout and was stuck in the pulley? I assume this was a spacer so i just put it back in when i put on the 8 rib pulley. I checked the bypass,tensioners,belts.Make sure your pulley hasn't spun on the hub. Did you torque it to 65ftlbs? Inspect for the belt rubbing on anything or signs of belt slip. Do your tensioners all have sufficient travel? Bypass could be stuck open, but I'm sure you checked that already.
I made one out of a party smoke machine but it didn't work out too well lol.