It would be nice to know, with some punctuation, what it is you want to accomplish other than shift the torque curve down.

Do you have enough converter or gear, or ar you trying to bandaid that situation by modifying the intake manifold?

Is the cam incorrect for your application? Is the cam timed correctly?

I ask because the very LAST place I'm going to correct a power issue like you are claiming is to mill the plenum down. That seems to me to be an odd way to do what you think you want. I'm not saying you don't need to correct the power curve, I'm saying that's the LAST way I'd attempt what you want.


I'd be interested to hear what other guys who do heads and intakes think.