Did you read my DIY article on timing chain replacement?

http://www.peachparts.com/Wikka/M117TimingChain

The m116's chain is a bit shorter, which means the process will take less time on a 4.2 than it did on my 4.5. It's easy to do, the mini vicegrips I used were like $0.99 each at Wal*Mart. Your guide rails will be plastic though, you WILL want to replace them.

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Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k