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Message: [QUOTE="Fast-6.0, post: 646309, member: 353"] Bringing this back up because we just got the flow tests done. We installed the Zmax on a ported cylinder head and flowed the rearmost ports. The cylinder head flows 197cfm @ .300" valve lift and 200cfm @ .400" valve lift. The stock manifold and ported cylinder head flows 154cfm @ .300" lift and 157 @ .400". The Zmax manifold and ported cylinder head flows 184cfm @ .300" lift and 189cfm @ .400" lift. So it still restricts our ported head but it flows more than enough for a stock head. I know the GOGO manifold was supposed to flow in the 240cfm range but I believe that was just the manifold on the flow bench and not flowing through an actual cylinder head so I can't say that those numbers are apples to apples for comparison. So at the end of the day what does this mean, the Zmax is beneficial to anyone. If you have stock heads its more than enough. If you have ported heads then it will help but could use some more. We will look into getting more flow out of the current Zmax for ported head guys. [/QUOTE]

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