Back to flow testing 3900 heads.

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Posting from my phone, so this is interesting. Can it handle the picture I took?

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Manifold porting first. +10 cfm at .500" bolted to a stock head.

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Ported manifold set on a stock head.

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Tidbits of info that might relate. The piston dish is 18cc. Compression is 10:1 from measurements. Intake valve has .120" lift before it clears the deck surface (stock). Exhaust valve has .160" lift before it clears the deck surface.