Thread: Rect. vs. Oval

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I guess I don't actually KNOW the rect's are too big, but based on all I've read and the recommandations given for mild/street engine builds, they are always opted out for the oval ports. I guess you get better cylinder fill at lower rpm's because of the smaller intake ports while not loosing any breathability. My initial guess was I would gain a little compression and better cylinder fill, and as Nitro said, this would put my power down into a more usable rpm range. I just didn't know if it was worth it...financially.

Originally Posted by DennyW

Or, if you blend the square port to enter in the right spot as the flow enters the head port, square ports will give added low end, and good top end.

What do you mean by that Denny? I don't understand what you're saying. Do you mean portmatching?