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How much of a difference in flow between ports?

Generation III Internal Engine 1997-2006 LS1 | LS6

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How much of a difference in flow between ports?

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Apr 3, 2006 | 06:44 AM

#1

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From: GB

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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?

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Apr 3, 2006 | 10:55 AM

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From: Sterling VA

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Quote:

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?

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Apr 3, 2006 | 01:47 PM

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GrannySShifting

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From: Glen Burnie, Md

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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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