Like I said earlier my engine is out of my car, I checked the studs 3 months ago and didn't see any difference in the top to bottom, The valve covers are now back on and unless needed I don't want to take them off until next winter when I do the stud and of course the valve clearances. I assume someone here knows by the serial #??????
Bruce Andersons book states "...and some of the late-1977 2.7 911 engines use Divilar head studs. The 911 turbo engines use all 24 Divilar head studs, while the normally aspirated 911 engines use 12 Divilar studs just for the bottom row.."
It doesn't say when the change was made in regard to serial #s.
Shawn
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