There isn't as many 560's as 420's that why there is a difference in chain failures.

Chain failures have been the same in single cam V8s since the beginning of time. The rails petrify after time and cause the same problems on all these models. The length of the chain makes no difference.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician