Definitely do the rails and tensioner (do them first) then check the chain for stretch. If after replacing the rails and tensioner your chain still shows 8*-10* stretch, roll in a new chain. Upper rails aren't too difficult on the V-8's and the tensioner is only a matter of a couple bolts (but holding the new tensioner against the block is a be-itch while trying to start the bolts).
This is in regards to the SLC.
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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.
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