Ken,
what torque f a ST2 (I have ST2 heads on mine and they leak as well)?
No leaks?

So torque seems the same, I`ve followed the 906 ones.
I have 0.35mm clearance on my 907 (& my M900 -97),
hmmm, could those 0.05 make a difference?

Make certain to follow the lubrication spec for the nuts/washers/studs. To get the proper load you must lubricate....

But not too much, keep those holes and surfaces dry and clean as a whistle. Lube threads only and drain excess Prefit and drain and clean again with soap and water no chemicals. Take your time and be meticulus unless you want to do it over. Had your studs out, keep those holes clean ,fluids do not compress and will throw off the torque and keep those studs too high and nuts will hit the shoulder of those studs and throw off all torque results. Also torque angle is more accurate than torque wrench unless you have stretched studs.Measure the length of those studs before you torque. All gasket surfaces need to be sharp and flat, no rounded or marred up edges.

Higgy,

Usually we are 100% on the same page. I have to disagree with you on this one tho. You must lube the face of the nut that makes contact with the washer. There is more friction in this area than on the threads themselves.

**Also torque angle is more accurate than torque wrench unless you have stretched studs.Measure the length of those studs before you torque**

I'm not sure what you are saying here. Yes, Angle of Turn can be more accurate than torque but no home mechanic will have an understanding of this and Ducati doesn't give a spec for AoT. AoT also starts with a torque value to firm up the joint before measuring AoT, so you can't get away from it!

All studs get stretched to provide the clampming force for the gasket to perfom is job and overcome any other loads induced while operating. If you mean over-stretched, measuring them will not give any indication that they have been yielded. If that has happened, you will not be able to torque them as they will have gone plastic and just keep stretching out until they part/fail. Ducati only stresses these studs to 50% of yield so even a 10-20% over-torque won't have damaged the studs. Maybe the holes in the case but not the stud. If in doubt, replace them!

I agree with the rest of what was posted. Cleanliness is next to Godliness.....