I did have plans to port the heads while the engine is in pieces..
The intake ports are typical GM 80s design, in this case steering the flow upwards and sideways via the blob in the middle of the passage, somewhat like the swirl ports on the 350 smallblocks(TBI version) althoug the intention of that one was creating a vortec.
the exhaust port definetly looks worse than the intake, the runner is not straight (at all) and there is a hump blocking the flow. This is probably a consequence of the spark plug location interfering with the exhaust port. Hmm
And this is what happens when trying to machine the hump to flatness.. and shape the port to a modern D-shape.
The extruding part of the hump is the wall, there is no additional metal behind it.. Everything looked ok until the last pass in the mill but Im glad I found out, otherwise I would have walls as thin as a hair out to the coolant. That would have been a catastrophe waiting to happen.. So heads up for that one if you plan to port these heads.
What you did with the exhaust port looks similar to how I ported mine. My main goal was to create a flat floor in the exhaust port, from the valve bowl out to the header. And as you mentioned, one has to be careful not to cut into a water passage, or the spark plug recess.
On the intake, don't remove that fin in the center. This seems counter-intuitive, but that fin increases flow by about 15%. That said, it might be a good idea to sharpen the leading edge, to reduce aero drag. There are some gains to be made from smoothing out the valve guide area. There are big hunks of metal sticking out into the airflow path. Plus the transition from valve bowl to runner is pretty ugly.
[This message has been edited by Blacktree (edited 11-25-2018).]
Great to see some pictures of other porting jobs and hear your experinece of this! Yes the runner tilts approx 7 degrees sideways so cutting at that angle would probably been better but then I have to watch the opposite wall instead :/ I may try somewhere between...
Thin cast design and water channels everywhere.. It will be a challenge to make any major changes of the ports, but trimming and minor adjustments looks quite easy. Its nice to see the pictures of other ports, and the la fiera dyno looks promising for modifying this engine!