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Old 11-26-2021, 07:12 PM
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steve25 steve25 is offline
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The main thing with any head is to utilize its port volume/ port area.
And in fact there’s a couple of ways to get on the right track with doing that.

One easy way is by running enough valve lift, yes you read right!

This involves some simple math and part of the
formula used is the Intake valve size.

The formula for the minimum amount of valve lift is this D/.25.
So for a 2.11” valve to star to well utilize a given port the valve lift needs to be a minimum of .527” .

I can’t think of anything more wasteful of a persons money then to buy any of the aftermarket aluminum heads that can be had for our Pontiacs and only run .480” lift or less!

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