2.5 or the 3.5 both use a chain.
chain
timing chain
1997 Avalon has a belt
belt
Belt.
The 3.0 liter V6 engine in a 2001 Toyota Avalon has a timing BELT
The 3.5 liter V6 engine in a 2005 Toyota Avalon has a timing CHAIN
According to the Gates website ( they make timing belts etcetera ) The 3.0 litre V6 engine in a 2000 Toyota Avalon has a timing BELT
Chain.
Chain
Chain
The 2013 Honda Accord has a timing chain. This is new for the Honda accord in 2013, previous years Honda Accord had a timing belt.