A replacement diesel
that will fit in an Atomic 4 mount and not be taller is almost impossible to find. I have seen several boats with the A4 under the floorboards, and with a taller replacement engine, would make a very awkward floor plan. Having to remove a fuel tank
to get to the prop shaft, stuffing box sounds terrible. There are so many old, old, A4s around that I would think one of these marinisers would find a short(less tall) diesel to market. Living with less H.P. would be easier than living with a clumsy floor-board. If you are comfortable with gasoline, then a rebuilt A4 would solve that part of the problem. It really is a beautiful boat. OH WELL. _____Grant.