The V10 in the SD's is called Ford's Best Kept Secret by many owners on Ford Truck Enthusiasts. Basically the power of the diesels without the special handling and maintenance diesels require (Yeah, I know - not exactly, but close enough for arugments sake). In 2005 Ford went to the 3V heads and they have a substantial power boost over the earlier versions (on the V8 and V10 - the 3V V8 had about the same power as the 2V V10). Spark plug spitting was a problem with all of the modular series engines up until about 2003 when Ford changed the head design to add more threads to the spark plug port. I forget the exact year but I think 2003's and beyond were good for that problem. All 3V engines don't have the problem.
HTH Not fixed until NOV 2008 here is the S/B.. This is probably the number 1 issue on the ford Forums. Th first page lists the Date range but it effects all mod motors until nov 2008 when New style heads entered the production line this is supposed to fix the plugs popping out and the plug breakage problem when you change the spark plugs.