Karl, Better You forget now that modification
I asked from two differend Ducati specialists this and they both say, that too big job, cause: 750 Paso cases have smaler diameter circle, where are those head studs (!!!!)= DONT fit to 900 sylinders, sorry :thumbdown: Also 750 Paso have 18mm hole/bearing in rods, 900 have 18mm hole/bearing and 851 have 20mm hole/bearing, so You have to machine also that and also many problems with piston lower part fittment to cylinder/cases ! Much more cheaper to You, to find 900SS hole engine,or new heads to 750 Paso.... Wondering, why U try so difficult way? :confused: They say, that Monster 750 engine(newer, than Paso cases) is little easier, but only little. Also You can have problems in 750 Paso frame, is there enough space for 900SS heads??? Wondering still very much that Your job :confused: :confused: :confused: