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Ls3 Intake Restricting L92 head flow by 40 cfm

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Old Mar 1, 2015 | 01:01 PM
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Default Ls3 Intake Restricting L92 head flow by 40 cfm

I recently purchased a set of 68 cc ported L92 West Coast Cylinder heads. They
Flow 357cfm @ .660 lift.. I also have a ported ls3 intake.. My head guy did a flow test with the intake bolted up and the flow numbers were down 40 cfm.. This is mainly because the intake ports on the heads were opened up and once the intake is bolted it causes restrictions because the intake ports are not ported enough.. How much of the intake ports can be opened up before it affects the ruber gasket?
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Old Mar 1, 2015 | 01:10 PM
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You will normally see a drop in CFM with the manifold bolted on. This is normal. 40cfm is norm or not i am not sure.
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Old Mar 1, 2015 | 02:14 PM
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How many engines operate with the valve in a continuous open state?
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Old Mar 1, 2015 | 02:30 PM
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Originally Posted by 96capricemgr
How many engines operate with the valve in a continuous open state?
What does that have to do with anything??
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Old Mar 1, 2015 | 02:40 PM
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You are fixating on what the head does with the valve held continuously open, what does that have to do with anything?
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Old Mar 1, 2015 | 03:00 PM
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Originally Posted by 96capricemgr
You are fixating on what the head does with the valve held continuously open, what does that have to do with anything?


When I say "open" I mean ported open
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Old Mar 1, 2015 | 04:04 PM
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Originally Posted by Z28Lq4
When I say "open" I mean ported open
He is saying don't worry so much about port flow when that measurement comes from comes from a valve that is not moving.
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