C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

What do heads REALLY flow??

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Old May 16, 2005 | 10:32 AM
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DrEvil11417's Avatar
DrEvil11417
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Default What do heads REALLY flow??

I've heard that some heads don't always flow what the manufacturers or magazines like CHP claim they do, out of the box?

Can anyone tell me what numbers you got when you flowed heads you bought?
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Old May 16, 2005 | 10:46 AM
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These are what my AFR and Protoplines did.

180 Protoplines



AFR 195 Race package.

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Old May 16, 2005 | 12:34 PM
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You may see variations depending on the bench used-Some flow them with a pipe attatched which seems to get a better number, some don't. Maybe an expert will pipe in here. Never flowed mine out of the box;only after extensive porting:we did the flow tests using a 1-7/8 in. pipe- Mine topped out at a hair over 300 cfm. Not the heads for my L98, I might add. This would be overkill in most applications.
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