Wow... If the inlets are similar there'll be next to no airspeed through them in a standard low comp engine. Lotsa volume though not great for idle or developing globs of torque in the low rev range. They'll work best right up there in the rev range as long as the ports are fairly similar (flow wise) between them all. You'd have to get them benched to really know though. Issy or Sam down at COME might be the man for the job if you can stomach the frieght costs to Melbourne and back. He is really good to deal with and no BS, he'll be able to tell/show you outright what the porter was trying to achieve with all that work. Though looking at what I can see of that exhaust port I'm tipping they are off a racing boat (big revs and torque spread somewhere from 5-6.5K).
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