The N 14 was offered in both electronic and mechanical versions side by side till at least 93. All N 14's 435 and up had the cast aluminium red valve covers while those under 435 had stamped steel black covers. The N 14 came in 330,350,370,410,435,460,500 and 525 hp versions as well as dual rated versions 330/370,370/435 and 435/500. I put hundreds of thousands of miles on these great engines.