English: Schematic view of inlet (blue) and exhaust (red) ports, highlighting the differences between even port lengths on a conventional V6 engine, vs the unequal port lengths on the Volkswagen Group 12valve VR6 engine
{{Information |Description={{nl|De kleppen van een VR6-motor 12V}} |Source=Transfered from [http://nl.wikipedia.org nl.wikipedia]<br/> (Original text : ''Eigen werk'') |Date=2007-06-03 (original upload date)<br/> (Original text : ''03-06-07'') |Author=Or