67Dart273 said

Or to try to further explain, timing chains stretch over time. In addition some engines originally were equipped with an alloy top sprocket with nylon? some sort of plastic /phenolic teeth. These used to troublesome, as the plastic wears down and the chain gets even MORE loose. Not sure if slants used 'em or not

Evidently they did, one of these blasted things:



There have been cases in many engines, not just Mopar, where those damn things "lost their teeth" and stopped an oil pump---breaking parts, such as the cam gear. This happened on a a 351 powered LTD II I got really cheap "back then."

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