So i did a rebuild on my Impala SS l67 and i have a few questions regarding the double roller, its used not new and had a little slack with the chain when i installed it and i wanted to know is that normal? can these chain have a little slack? Its not horrible or really bad i just want to make sure its fine i have no problem in tearing the front cover off and replacing it with a new one i used the chain on my old xp build but this build has the xpz and i know the xpz is a little more agressive then the xp thanks guys!!