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 "somewhat ported" TB port
Measured "somewhat ported" TB port
Measured "somewhat ported" TB port
Measured "somewhat ported" TB port
Measured "somewhat ported" TB port
TB ports marked for 58mm TB gasket match
Runner ports marked for large-tube gasket match
One pair or runner ports siamise ported and measured
One pair or runner ports siamise ported