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does a broken timing chain usually mean that valves have to be replaced on car? on 2002 Pontiac Grand Am

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my 2002 pontiac grand am had the timing chain break and mechanic says tha t valves will need to be replaced and that its a common occurence wh en timing chain snaps.
(1) Answer
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GM does not say if this is an interferance motor or no but you can pull valve cover and ck rocker clearance or see if a spring is stuck down
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