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timing chain would be my first suspicion
pull valve covers and check the rails ...
if you need to get at lower end of engine I would pull it. My advice comes from working on 500 SEL so somewhat different but FWIW...
Good luck.
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dloveless
1984 500 SEL [131K]-
1991 GMC Sierra 4X4 XC [162K]- War Pony.
2004 Jeep Liberty Limited [8k]- wife's sled- Belle.
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