Duesenberg J carburators

twistwrench wrote: I've seen some J cars with updraft carbs, and some with downdrafts. Was there a year or chassis number change? Which style came first?

Updraft carbs came first, I believe the change to downdraft was in 1931 or 1932. Many 1929 - 1930 J's have been updated with the downdraft manifold & carb.

I've seen some J cars with updraft carbs, and some with downdrafts. Was there a year or chassis number change? Which style came first?