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average gain??

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Old 08-26-2007, 07:52 PM
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whats the average gain of hp on ported heads?
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Old 08-27-2007, 01:46 PM
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There are a hell of alot of variables but id say the norm is around 20-40 Hp
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Old 08-27-2007, 05:23 PM
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Depends on who ports them, what castings. Like said too many variables. Get a good set of AFR's and gain 40rwhp.
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Old 08-27-2007, 07:17 PM
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there 806 heads i know their five angel valve job and i know i gave him the specs from the cam!! the cam is 233/239
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