Some have a belt and some have a chain. I know for a fact the 1991−1997 has a cam belt that MUST be replaced every 60,000 miles. This is an interference engine. I would check with a GM dealer on yours to be 100% sure.
In a 2004 Toyota Highlander : The 2.4 liter four cylinder has a timing CHAIN and the 3.3 liter V6 has a timing BELT
In a 2004 Toyota Highlander : The 2.4 liter four cylinder engine has a timing CHAIN The 3.3 liter V6 engine has a timing BELT
timing BELT
timing CHAIN
timing CHAIN ( 2.2 + 3.5 liter )
timing CHAIN
The 3.5 liter V6 engine in a 2004 Nissan 350Z has a timing CHAIN
It must have a timing CHAIN because Gates ( they make timing belts etc. ) doesn't list a timing belt for the 2004 Chev Malibu 3.5 liter V6
timing CHAIN
The ( 3.4 liter V6 ) in a 2004 Pontiac Grand Am has a timing CHAIN
It has a Chain.
Timing BELT for the 2.4 liter 4 cylinder and the 2.7 liter V6 in a 2004 Hyundai Sonata