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Hello,

I have a 351W and would like to port the heads.

Specific question.
I can imagine that the intake flow gains much horses, because suction on the intake is vacuum from zero upto minus 0,xx bar.

However exhaust flow, flows from approx 8 bar combustion to zero. I can imagine that a 40 or 50 cfm improvement does wake any horses, and if just a few.

Anyone ever seen dyno's from intake tuning only and exhaust tuning only. So the realtion to the increased cfm of the port to the horses can be made.
 

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Intake and exhaust work together. You can just port the intake, but if exhaust flows poorly, cylinders will not evacuate and volumetric efficiency suffers. I have my engine apart and I plan to take some pics of the ports on my ported '70 351 heads that I wished I took before I put it together 3 years ago. I hope to post the pics soon.
 

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Fords have some nasty exhause issues to begin with. JUST porting the exhaust on 351W heads will get you some noticeable power.

Cris
 

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