1st gen has pressed on keyed pullies on the front of the jack shaft. It allows for a 1.5" pulley on the shaft I think. All newer ones have 4 bolts that hold them on. They allow for 2.7" pulley. I seen a 1st gen M112 peak at 14 psi on a stock 6.0. M112 and M119 look alike. Hard to tell which one it is.
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