alright. I can let you in on this. I have the 5 port. Honestly, If I had a better, more reliable source, they are all I would run. Stock timing is as follows:
HUGE head space, like .022 without any shims. (needs the top of the block machined down, just like the nova's)
.19cc total volume.
172 exhaust
122 boost
126 intake
induction closing right around 55*
It does have an actual marine crank. (fully threaded, not the SG style)
The cooling jacket is a dead nuts copy on the underside, just like the nova's. Needs to be reduced, as its moving too much water through the head.
Turbo crank. Let me find some pictures for you.
Chris helped me with mine tremendously. I have no clue on the speed, as I dont have a gun, but I will say, Tim Leyde has a 5 port Nova in his PT, and it was a very comparable runner with his boat. The GO was just abit faster. (mine had a raised exhaust port at the time, nothing else) to his stocker with adjusted head space. Im not starting a motor war here, just stating real world experience.
Here is a video when it was still fresh. Had maybe 10 tanks on it at this time. Still tight enough I had to turn it over with a wrench at TDC. Its in a PT SS21 hull. (Chris got it running quite abit faster then this when he came down and helped with the boat setup)