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Old 10-16-2006, 01:15 PM   #1 (permalink)
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Porting 351W heads

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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Old 10-16-2006, 01:15 PM   #2 (permalink)
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Porting 351W heads

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Old 10-25-2006, 04:01 PM   #3 (permalink)
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Porting 351W heads

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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Tracy Blackford: Anaheim Hills, Ca
'65 Mustang, 331 custom built with 289 H beam rods and 383W piston, 282S cam, self ported '70 351w heads, T5z, 9" w/3.50s.
430 HP @6500
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Old 10-25-2006, 10:02 PM   #4 (permalink)
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Porting 351W heads

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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Old 11-01-2006, 02:57 PM   #5 (permalink)
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Porting 351W heads

You can go here for more info on ported 351w heads:

http://forums.vintage-mustang.com/sh...p?tid/1442844/

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Tracy Blackford: Corona, Ca
'65 FB Mustang 331, 282S cam, ported 351W heads. T5z, 3.50 9" posi.
346 RWHP@6400 on a warm spring day (335 RWHP SAE corr.)


<font size=-1>[ This Message was edited by: blkfrd on 11/2/06 4:57am ]</font>
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