there was a "v" belt on my vette that was there when i bought it and it lasted about 7,000 miles before it dryrotted and broke. i could not find someone who sells the "v & w " models so i had it interchanged with a dayco. the one they gave me , no matter how much i tighten it , it keeps stretching and breaking. as if maybe it is too far down in the pulley , i dont know. i looked at both belts and they look the same. anyone have any ideas ?