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Sorry for my ignorance, but what is the "boss"?

Here are some other pics.

This is a link I found. Are we sure there is no oil running through the piston head? http://www.marinediesels.info/2_stroke_engine_parts/piston.htm

Thanks. This is good info. Is there a pic of the inside of the block on an oil cooled 855? One question. What is a "boss"?

Aaa. I have seen a rod that had holes to spray the bottom of the piston. I think it was a slant 6 dodge. But I thought it was to oil the cylinder wall for lubrication. If that is the case, are the pistons different or just an oil sprayer? If it is just an oil squirter, It seems that you could...

I always hear that the 855-250 cumins in these trucks don't have oil cooled pistons. Does anyone have a pic of a oil cooled piston vs non-oil cooled? I assume the oil cooled has holes in it that oil runs through the head of the piston. Does it have different rods for the extra oil? I would...