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Hello Tim,
You are correct in all your interpretations!
The exhaust is internaly cast.
The exhaust ports enters into a almost straight tapered pipe. So there are no separate primary pipe at all....

Tim,
I don't have any pics of of the ex-ports looking in and I think that a photo like that might require a small mirror (and a steady hand:) ). I'm going to my work shop tomorrow and I will give it...

Thanks Dale!
Will give them a try next time I need some hard to find part.
//Per

Thanks for the kind words!

Hopefully I will be able to at least give you some "on boat performance report" once the boat I'm working on is back on the water. It might take a while though...
...

A bit off topic but...

The Powerheads for VP700 / AP70 were built in Uppsala Sweden.

I have been told that the first prototype of the Volvo / König GTX700 engine had a cast iron block and the...