Chain Cam Drive

Watched the DVD of engine assembly. Surprised to see a long chain, with two apparently nylon tension shoes.I remember the SOHC 427 Fords. They like to spin but the chains didn't
like it. They must have refined them a lot as the 6.3 is supposed to live a long life at 7200 r This thing screams. Too bad it is not as tuned to the SLS level.
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