What year is your volkswagen engine the number stamped on it is 5851140?

The number 5851140 on your Volkswagen engine indicates it is likely from the 1960s, specifically between 1966 and 1970. This engine number suggests it could be a type 1 or type 2 engine, commonly found in Beetles or Transporters from that era. For a precise identification, you may want to consult a detailed Volkswagen engine number guide or a vintage Volkswagen expert.