Allis Chalmers I600 - Proper spark plug

I600 is based on the D17 tractor, so whatever that engine calls for. I don"t have my book handy.
 
I don't want to start a fight, so I will ask a question. Isn't the I60/600 based on the D-15, with the 160 cubic engine? If so, AC fire ring 45's are what we always usedta use. You can get them in several heat ranges.
 
I had kind of thought the I400 was based on the D15, and the I600 was based on the D17.
C H Wendels AC book page 336 shows pictures of both. According to the spec's. and pictures, the I400 was based on the D10/12, and the I600 was based on the D15.
I suppose it depends on fuel, climate, etc., but Champion spark plugs have never been friendly in these engines. We also always used AC 45's. Now I use Autolite. The hotter ones seem to work fine. 295 comes to mind, but that's by memory.
 
Thanks very much for all of your assistance and input. I am really not sure of the engine size. There is a stamped number on the block that reads
160-159845B.
Could those first three digits mean 160 cubic inch? At first I thought those 3 digits indicated from I600 engine.
 

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