None of the "ported" stuff available I've seen has done much actual port work, I haven't seen the inside of an obr or bart engine, and for what we mostly use alx and rc max don't matter much. The thinners gaskets to make up for squish doesn't seem to affect how they run much, typically raising the port roof would be advantageous, but I like the lower exhaust roof to begin with, and theres not a lot of meat to play with the intake port to raise it. I also haven't found a good reason (performance wise) to raise the transfers either, making the intake side transfer a bit wider seems to help a good bit, as well as squaring off the port roofs. Not a lot of real estate to work with on these things, which I'm sure you know from your boat work. On my g320 I raised the intake roof 2* but couldnt tell you weather it helped a lot or not, just after i was finished with all the port work I was able to go up 2 teeth on my spur gear, and not loose much in the bottom end. When your dealing with stroker kits, you machine your squish band to get the height and set squish at the same time, so really the numbers change quite a bit, but again it doesn't seem to matter to the production guys. I have both a red arrow and esp stroker top ends and neither have done much port work. Transfers on both were done up a bit, but little and no intake or exhaust work done. The esp did polish the ports, but (imo) that doesn't do a lot on an already nicely cast surface. On my own port jobs, I found widening the exhaust port helped far more then raising it, and tbh theres no point to lower it, the piston is the limiting factor for that. I would like to relief cut a piston and see how it acts, but I really don't want to sacrifice torque for a few more r up top.
