Will blown Timing Chains on a Cevy Tracker 2.0L engine damage valves or pistons?

Yes, a blown timing chain on a Chevy Tracker 2.0L engine (and most interference engines) will very likely damage the valves and/or pistons. Because the timing chain synchronizes the crankshaft and camshaft rotation, a broken chain means the valves and pistons are no longer moving in their precisely timed relationship. This can lead to the pistons hitting the valves, causing significant damage to both.