Edlebrock RPM head clean up

If you’re not going to have the seats recut, then all I’d do in the bowls is blend away any ridges in the transition from the seat to the bowl.
Exhaust opening: blend away that ridge near the flange……doesn’t need to be any bigger.
Intake opening: opening size is fine as cnc’d, pinch width is usually inconsistent and can be a bit lumpy.
Open it to about 1.140”, and smooth out the lumps.
#3 & #6 will be close to 1.140 as cast, but I still make the curved wall similar to the shape of the other 3 ports, but the pinch in those two will end up bigger when you do it that way.

None of that will move the needle very much on the flow bench.

An important thing to keep in mind with those heads is…….there aren’t really any big gains to be had by doing a minor clean up.
The basic shape of the heads are fine.
The “bigger“ gains out of those heads come from making them bigger, not by changing the basic shape of the ports.

As an example, the MCH cnc’d std port version ends up at 255cc’s(but flow a bit less than the TF240).
That’s a fair amount of material to take out of a street head(210cc up to 255cc).