Quote:

CNC is repeatable, but can't take advantage of making the port as big as possible because of casting shift.


Why would you want the ports larger on core shifted heads?

Quote:

A good hand porter can feel/hear when the walls are getting thin.



Really?
Now thats a skill I would love to know..Im sure its possible at the point were its almost through the side of the runner...LOL..
But at this point the heads are trashed anyways.

IMO
CNC porting will get the ports as close as worldly possible from port to port..

I will say this the CNC program is as only good as the guy wo copied and wrote the script the machine reproduces.

its getting close to the end of the year and Modern Cylinder offers a great deal..
He has done several sets of heads for me including the 440-1's you speak of...

The flow numbers are good, but most importantly so was the track numbers..

[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]