Quote:
Originally Posted by secondchance
Marc had told me typical belts listed for LT5 are 80.5" and suggested Dayco 5060800 which is 80". So, I picked up Dayco 5060800 and, sure enough, it would slip on barely with the tensioner fully retracted. This pushes the tensioner so that the tension is increased keeping the belt tighter and keeps the tensioner from bottoming out - fixed!
Further research, out of curiosity, led to a corvette forum discussion regarding the belt involving WVZR-1. It seems original belt specified by Chevrolet is 2037 mm (80.196"). It seems, possibly out of sloppiness or to mitigate owners returning the belt claiming to be too short, belt manufacturers somewhere along the line started to show 80.5" belts as being correct for our LT5s.
There are car to car variations and manufacturer to manufacturer variations. Nonetheless, if you notice unusual clattering at idle and notice the tensioner bouncing around excessively, check how much play there is between the belt and the power steering pulley. There are belts with incremental dimensions and one of these may be a perfect fit.
What I have found so far:
Dayco:
5060800 - 80"
5060805 - 80.5"
Goodyear Gatorback (Continental Elite)
4060801 - 80.1"
4060802 - 80.2"
AC Delco
6K798 -actually for 2012 Corvettes
80.375"
Thought I would share my findings and save other owners from replacing belts and tensioners unnecessarily due to similar situation with unexplained noise.
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Good Stuff......if you find other belt lengths....post up in your first post
If others find different belt lengths with Part #s, secondchance can post into his first post to complete the story 
I added to
-Solutions- second page under
Alerts 
What is the link to the CF Discussion you refer to?