So it looks like Motors does NOT show the SOHC, but Rotunda DOES show the SOHC?
Of course Motors shows the 1968 R-code 427 so who knows what info they got.
I looked in my 1967 Ford Shop Manuals, no reference to SOHC in there.
Those same shop manuals show the 324-324 cam in all 427's, 4v and 8v, big car and unibody, for 1967.
(Some sources show the smaller 306-306 cam in the 4v or unibody cars, and they all have .500 net lift so the confusion lives on).
They also show the 390GT cam as 270-270 duration (not 270-290) but .481 .490 lift. Hmmm....
I wouldn't worry too much about the copyright thing for what we are doing here, there is an exception for research & academic purposes which I think is what we are doing here. I don't see any of us making money from old SOHC engine codes.
EDIT 27 May:
Ok I thought it was just my shop manuals but I found the SOHC codes. They're in the FRONT of the book, but are not listed in the engine section, maybe because they weren't ever factory in a car?
1965 (1st print Sep 1964)
L=SOHC-4v
M=SOHC-8v
1966
none listed
1967
L=SOHC-4v
D=SOHC-8v
1968
none listed (as if!)
Why did the SOHC get dropped for 1966 but re-appear (in the book at least) in 1967?