I'm not sure if this would apply to your car, but my brother just had his timing chain done, not sure if rails and tensioner needed, but he spent only $500.00 on a 1985 380sl.

But that is here in los angeles.

I think he only had a new chain put in

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon