Ported intake manifold

[slow4dr]

I had some clutch issues last week that required the tranny to come out so while the car was down I figured I'd port the intake manifold. I mainly wanted to make a velocity stack inside the plenum but once I removed the plenum I realized there was lots of room for improvement. I am about halfway done with the plenum and I'll move onto the runners next. Kind of hard to tell by the pic but the throttle opening is tapered now instead of straight through. I also blended it to the plenum in the areas where it was possible.Stock left, ported rightStock left, ported rightStock left, ported rightHere's how much aluminum has been removed so far and this is just two holes done.

[Raven]

Did you go at it with any tried and true method or just freestyled it?

[AKLGT]

very nice. that's a lot of useless aluminum there! it's amazing how much porting something like your intake manifold give you free power.

[slow4dr]

"Did you go at it with any tried and true method or just freestyled it?"I've spent time with a flow bench in the past so I have a basic idea of flow characteristics. Once I removed the plenum it was easy to see where improvements could be made. There is a ton of extra aluminum in the plenum outlet into the runners. I made a small fixture that lays on the runner mating surface that folds into the plenum so I could duplicate the velocity stack angle on each port. My hands are numb today from holding the porting tool. I figure my time is probably worth 1 HP every half hour. LOL