Domni exhaust ports

If you mean the thread, then yes. The angle the port exits the head is different for earlier heads though.
 
If you mean the thread, then yes. The angle the port exits the head is different for earlier heads though.
Not the threads but the port shape. Do you know when (what model domni) the port angle changed? I'm wondering if the raised D exhaust floor with fit any Domnis?
 
The exhaust ports are all the same shape in the 650 that had the ss head, 88ss(with the 650ss head), atlas, 750 & 850 commandos. In other words, all production models that used heads based on the 650ss head.
 
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