I love me an old Detroit. Worked for a marine construction company and all our equipment was powered by them. Guy at work tore one down and rebuilt it in the shop and fired it up just sitting on blocks. Was a little scary as I was on run away patrol with a piece of wood in hand to smother the intake of need be. He collected all the series and had almost all of them. I think he had 12v71 in the barn (edited)