IS A 2.9 CHAIN DRIVEN A INTERFERENCE ENGINE
SOURCE: is this engine free wheeling or interference
Both 2.4L or 3.1L will bent valve's, interference engine's.
SOURCE: VALVE TO PISTON CLEARANCE ENGINE
The 2.2 eco is a chain driven engine it does not have a timing belt but if for some reson the chain were to break I would imagine there would be some damage but having the chain break would be something I personally have never seen. Hope this helps
SOURCE: 2006 cobalt 2.2 liter-----timing chain broken
I have never seen a chain motor that was not interference.
SOURCE: putting a new water pump on a 2001 4x4 2500 chevy
50/50
If you have gotten as far as that , I would suggest changing the timing chain and gears just to increse performance and fuel efficiency.
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