Now you got me all concerned. My 500sel has 215k miles with original chain. The only noise I hear is from a lifter. It comes from the right bank and I think the camshaft is worn. I haven't checked it out yet because engine is running fine (except the slight ticking noise). It actually has gotten more intense so it got my attention. I have a set of 4.5l camshafts from a 1973 sl. Do they fit?

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Karl
1994 E320
1985 500sel
1972 350sl