[THEFERMANATOR]

Pretty simliar engines actually. The 87 is a small bore, and the 88+ is a large bore. The large bore engines tend to be a bit more forgiving, but use a tad more fuel. The small bore engines ran a bit stronger though I thought from the ones I've run, but that small bore engines performance melted more than a few down and is why OMC only made em for 3 years. As for the physical differrences from a 140 to when they went to the 130, I believe all they did was use the smaller 120HP tuner on a 140 powerhead to give better bottom end and emissions(plus it made one less engine to offer for sale).