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How much of a difference in flow between ports?

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Old 04-03-2006, 06:44 AM
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Default How much of a difference in flow between ports?

My CNC ported head flows from 5-13 cfm different between ports on the same head.

Main difference being 13 cfm at 500 lift.

Is that something I should be concerned about? Seems like a good bit for a CNC port.


Anyone else had more than 1 port on there heads flowed to see the difference?
Old 04-03-2006, 10:55 AM
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Originally Posted by ATVracr
My CNC ported head flows from 5-13 cfm different between ports on the same head.

Main difference being 13 cfm at 500 lift.

Is that something I should be concerned about? Seems like a good bit for a CNC port.


Anyone else had more than 1 port on there heads flowed to see the difference?
That doesn't sound right. Who did the CNC work? Is there visually a big difference between the ports?
Old 04-03-2006, 01:47 PM
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The ports look the same but you wouldnt be able to tell much from the naked eye.

Its a well known aftermarket casting.




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