Quote by Archerytony: "I have had my 400 done 3x and its knocking again less than 5000 miles I have done motors in the past myself with better luck than the shops I have done them with."
Not as much has changed as you would think. Use of the "old books" shouldn't result in "knocks" any more than a newer book would.
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"Objects in mirror are closer than they appear" 