WHAT DOES JDM NISSAN SR20 TURBO ENGINE FOR SALE MEAN?

Listened to about the JnJ motors guys from my Mate within the States. Decided to send out in my SR20 for machining halfway across the globe from Europe to the U.The timing chain may result in a rattling sound when it’s stretched or free as a result of improper installation, previous age, or in the event the teeth within the sprockets are worn out