Brice,

If the engine now produces a sharper more prounced and slightly louder clack vs a flatter muffled sound that is good. It is how they sound when correct, a quiet 615, 616 or 617 isn't "dialed in." Or worse yet, has low compression, sounds crazy but better is a little sharper and clackier on these. I had a '78 240D that was really quiet...needed a rebuild due to low compression, after the rebuild she definitely announced herself!

Have the valves been adjusted? It is critical on these, don't overlook them.

Good luck!!!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer