Some of you out there are consuming too much caffeine before typing!
The only reason ports are EVER D-shaped, or rectangular, is when a desire to increase the port area is constrained by some object ... whether an injector boss, stud, dowel pin, water jacket, etc.
The simple fact is that the US patent office is staffed by clerks and lawyers, not engineers or scientists ... so you will find plenty of 'mumbo-jumbo' in patent applications! It is purely intentional, and designed to confuse, intimidate, and appear 'original' in thinking!
How about some nice rectangular ports on your 911 heads?
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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