Stock plenum has 48mm openings for Throttle-body (TB) and 39mm openings for stock runners. I had already cleaned up the TB openings a bit, removing the EGR bumps and alot of the sides. It was about ported to about 40mm runner openings and 51mm TB openings when I began this latest round of porting.
It was gasket-match ported to Siamised Large-tube runners (45-46mm) and a 58mm TB.

Click on any image below for an enlargement (~500K) image.


Measured "mildly ported" runner port


Measured "mildly ported" runner port


Measured "somewhat ported" TB port


Measured "somewhat ported" TB port


Measured "somewhat ported" TB port


Measured "somewhat ported" TB port


Measured "somewhat ported" TB port


Runner ports marked for large-tube gasket match


TB ports marked for 58mm TB gasket match


Runner ports marked for large-tube gasket match

Porting:


One pair or runner ports siamise ported and measured


One pair or runner ports siamise ported


Full View of ported TB ports


Ported TB ports measured


Ported TB ports measured