Here are some specs...
Head Inlet Ports
Primary Before: 33mm
Primary After: 33.5mm
Secondary Before: 34mm
Secondary After: 34.5mm
Mainly took the ridging off and all the casting flash still left. It's obvious they EH'd both ports and then milled the top surface!
LIM
Primary Outlet Before: 32.5mm
Primary Outlet After: 33.5mm
Secondary Outlet Before: 34mm
Secondary Outlet After: 34.5mm
Primary Inlet: 33.5mm
Secondary Inlet: 34.7mm
UIM
Primary Outlet Before: 30.5mm
Primary Outlet After EH: 33.1mm
Port matched the last 3-4" to: 33.5mm
Secondary Outlet Before: 31.8mm
Secondary Outlet After EH: 34.4mm
Port matched the last 3-4" to: 34.7mm
I evened out (rounded & cut off ridges) all the outlet ports before I sent it to EH so that +1.6mm should be a good indication of uniform enlargment through the manifold.
The split at the mouth of the intake looks so much wider! Yet the TB opening really didn't change. I was planning on hand porting the front side walls, but didn't think it needed it anymore. I just smoothed out some imperfections and went with it...
