The end irons.
It looks like they were ported mostly outward. The aux ports look a little different from each other.
The plastic is a crappy template I made a few years ago to resemble stock ports.
You can see the difference.
I found a very slight wear on the ends of the side seals. And found very slight wear on the top edges of the ports. Maybe that porting caused this?
Anyway, I'm going to slightly bevel those ports.
I also found spots on the rotor that were really clean, instead of having the oil and carbon residue. These spots are on the sides and on the faces of each rotor.
Kinda find that weird.
BTW: This motor only has 55k miles on it since its first rebuild.