Stay away from Dayco belts... I have gone through 3 of those suckers and they always go bad at about 3-4k miles. I have replaced pully's idle pullers, new waterpum (not for that reason) and a tensioner and the belts still go bad..
I bought a more expensive nappa belt and it seems to do a much better job at keeping quiet then the dayco belt. So far no issues, if you look that name up on google other people have the same issues with dayco. The problem seems that dayco belts stretch way too much. Mine were all stretched out and so were the other people who had issues with dayco on google.
2013 6.2 V8 Camaro SS 2300 miles :-)
1998 5.9 V8 Limited Platinum ZJ 141,xxx miles
1998 4.0 I6 Laredo ZJ 200,003 miles Yay !