Porting stock heads

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I'll have to look into the details of porting heads then, I always thought it was as simple as, 'shave away some iron, and you're good' but it seems that there's much more to it.

Is it possible to make a homemade flow bench? I've had several ideas that reached so far even as to use those little things hospitals give you to test your lung capacity to monitor flow. Obviously, I don't have the money to buy one done right, but I was wondering if theres any way to make one equally as gitter'dun as my heads will be? It doesn't need to be PERFECTLY exact on a set of stock heads for the car to run well, does it?

Oh, and I also want to let ya guys know that I really appriciate all the help I've recieved here. Very nice to be able to ask these questions to such a large audience of experienced people. Thumbs up to ya'll and the site.