It was Massey that used Chrysler industrial engines.  I've never seen a Deere with a Chrysler engine in it.  Others included Co-op, Simpson, etc.

Somewhere I read, or at least think I read, that John Deere used to use Mopar 6's in a lot of selfpropelled farm machinery.Now that I think about it some more my neighbor had a JD swather that had one a number of years ago.

Just saw some info regarding these engines.  The I 30 and I 31, were identified as 230 cubic inches.  There is some good info on All Par regarding Industrial applications.  It mentions that in a lot of occasions chrysler sold bare unnumbered blocks to these rebuilders.  They could stamp their number onto the block boss, but looks like many of them did not.  Some attached their own data plates, some didn't put anything on.  If you have some time to do some sleuthing, check in your area for places that might deal with old forks lifts, stationary generators, portable welders, and irrigation pumps.  many of these items were powered by mopar flathead 6's and they might have some reference material for these industrial engines.

Finding a list that would show what year an Industrial Engine is has long been on my search list - if such a list exists, I haven't found it!  If anyone has a source, I'd sure like to hear from them!

Thanks for the info, I have driven this car so, it was running real good but needed the manifold replaced, I have completed that. I was just looking for some info on it. It is a Jasper rebuit unit. I have talked to some one over there but they could not give me ANY HISTORY on this engine. They told me that they don't keep records on these things as far back as 1989 and I think it was put into the car sometime in the 1970's. So they could not help me. They have been around from 1947. I thought that they could help but no luck. I think that they just don't want to go through the old paper work that they may have.

The year of the block is sometimes cast into the area below the distributor but that may not be the case with Industrial engines.  You can recognize a block built after 1950 by the extra water passage at the front of the head which can be seen as a bump between the water pump and the head.

Blocks cast after 53 have three holes along the pan rail flange below the starter ( rather than 2) to support a brace for the  Powerflite transmission.

Cylinder heads often have a P  or a D   and sometimes a date.    If you want to know whether it is a 230 0r a 218, you can remove the timing plug over #6 piston and measure the stroke with a piece of Welding rod    4  3/8 for 218     4 5/8 for 230

An Industrial block could have sodium valve stems , harder seats and better bearings  so it may a good thing but if it is used in a passenger car, it must be equipped with a passenger car distributor with vacuum spark control.   

A parts catalog from the 50s which lists rebuilt engine assemblies may give you more information.

I have a industrial motor in my car, and would like to know how I would find out what year this thing is. It has the # of? ? IND30*6455* ? on the block. Would this thing be a Dodge or Plymouth block?? any help would be wonderfull.