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Edit: The 3.5L Engine is a "non-interference" type engine, meaning that there is enough clearance as to not cause valve damage as a result of a timing belt breakage.

It pretty much self destructs. Any time any timing belt or chain breaks on any gasoline engine at even 10 mph, the engine will sustain permanent damage to the internal parts. The operation of all the parts inside the combustion chamber is timed to operate in and share a very small space. These parts inside each combustion chamber (2-4 valves and 1 piston) have to move back and forth and get out of each other's way with very high speed and strength and flawless timing. One small misalignment of that timing will start a chain reaction that can destroy the motor. The piston slams into the valves, bending them- their trying to pull back cracks the head etc. You'd be lucky if it's just the heads that need replacing.

In my experience you have a 50-50 shot of bent valves on that engine.

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Q: What happens to the motor of a 96 Dodge Intrepid 3.5l when the timing belt breaks at 65 mph?
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