I found another set of twins when I lifted a hatch in the center of the salon: two optional 660-hp Caterpillar 3196TA diesel inboards. The alley between these big engines is a little narrow, barely wider than the span of my shoulders, and without hatches directly over each engine, access to their outboard sides is not at all easy. But the compartment is well organized, and daily maintenance can be undertaken comfortably enough. [links]