Mr.R wroteHi Marvin,
I only know/found out because I fitted modified 916SP heads to my 851/916cc motor and then had to buy a smaller cover, that came labelled as a 748R part.
My 955cc motor has genuine 888 "G" Corse heads and they use the larger/deeper covers.
I run 35/30 valves in my 916SP heads, but I've fitted 37/32's in my "G" heads for my 955 motor.
Steve R
I know that you don't like the testastretta engine but the standard S4RS Testastretta comes with the S cams, 100mm bore x 63.5 mm stroke, 40mm intakes, 33 exhaust. The included valve angle is 25 degrees wheras the desmoquattro heads are 40 degrees. Makes one not want to mess with a desmoquattro.
p.s. All of the ducati 4v cam info. is here.
http://www.bikeboy.org/duccamspec.html