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Will valves hit pistons in your 4.0 jeep if chain breaks?

No, the valves will not hit the pistons in a 4.0 Jeep if the chain breaks. The 4.0 Jeep engine is a non-interference engine, which means that the valves are designed to sit below the top of the piston when the piston is at the top of its stroke. This prevents the valves from coming into contact with the pistons, even if the timing chain breaks.