As the ques, says... Did anyone here anything bad about using aftermarket crank pulleys?

 

Factory crank pulleys have an integrated harmonic dampener. The rubber strip in the middle. I've have not ever seen and aftermarket pulley with it. Its important, especially for reliability. I would only use a factory one.

 

I'm with Ryan on this one.....

 

There was at least two or three threads on this very question, check them out. The search button will help you find them......