[Anaxagoras1986]

Do aftermarket heads flow very much more than the SVT head? Word has it that the SVT head is really nice on the flow bench.

 

[WD40]

So far, the SVT head (even in stock form) has pretty much beaten anything else out there.
See here...note comments from 1turbofocus:
http://www.focusfanatics.com/forum/showthread.php?s=&threadid=88146

 

[Anaxagoras1986]

Aside from the VCT servo galleries, what other differences are there? Bigger valves, and ports I assume but if the combustion chamber different? What about the port geometry?

 

[svt2nv04]

for how much it costs, it's not worth doing for what gains you get out of it

 

[Anaxagoras1986]

I was not considering getting a new head. I was just curious as to the differences between the Zetec head and the SVT head.

 

[1turbofocus]

Combustion chamber and Exh ports are almost exact between the 2 heade the Diff is in the Intake runners they are raised as well as bigger in the SVT

Tom

 

[Anaxagoras1986]

Cool that's exactly what I was wondering! Thanks Tom!

 

[WD40]

^^^And:
1) The intake valves are 1.5mm larger at 33.5mm. (not sure about the exhaust, they're 28mm)
2) Stiffer springs by 27%-intake and 19%-exhaust.