Like so many i too considered replacing the flow with a Zetec engine a while back however for me there is something very special about a well tuned xflow.........The simplicity, the noise and indeed the history is what did it for me. Following much research and many questions asked it was 2011 i eventually settled on a Ratrace / Protune rebuild creation. All this is hooked up to Weber Alpha TB's and Emerald K6 ECU. Loads of torque, Loads of power, Loads of wonderful noise and above all tis pretty dam economical too thanks to the 3 way switchable map system. Certainly returns 30 to 35 mph in its eco mode. Other than adjusting the valves once in a while and the usual oil changes theres nowt to them. Solid reliable engines. So reliable and so well thought of today that they are now supplying brand new Kent 711 engine blocks. As has already been said parts are fairly easy to get hold of however prices can be on the high side. Now that there seems to be renewed interest in the Ford Kent xflow engines again it seems the asking prices these days for a well tuned engine commands a very high price indeed. These engines could well be most sort after in the future if they aren't already Love my Flow