intake port at the pushrod hole

Just how much does it help flow by straightening out the intake port next to the pushrod hole?
Is that something that every factory head could use?

thanks

The key is airspeed not air flow at the pp pinch.
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Ok, so how much does it help with an E7TE small block head? Everything I've read or seen says to do away with it as much as possible without going into the pr hole.

If your measuring it on a flowbench, you'll be disappointed at the flow gain. But you need to realize that the pushrod pinch is the SMALLEST point in the intake tract. So by increasing the area and getting closer to the average port cs, the better the engine will breath, especially at high rpm.
On the E7's you want to raise the roof as much as you can and widen the ports some.
The valve job is very important here, as well as using a 12° back head valve and a 30°-33° back cut.
Personally, unless you just cannot scrape together a thousand bucks, I wouldn't use the E7's . Almost any head on the market aside from fords replacement crap will make upwards of 40HP right out of the box.
Brian
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<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font size=-1>Quote:</font><HR></TD></TR><TR><TD><FONT SIZE=-1><BLOCKQUOTE>
On 2007-04-06 22:45, ou812 wrote:
If your measuring it on a flowbench, you'll be disappointed at the flow gain. But you need to realize that the pushrod pinch is the SMALLEST point in the intake tract. So by increasing the area and getting closer to the average port cs, the better the engine will breath, especially at high rpm.
On the E7's you want to raise the roof as much as you can and widen the ports some.
The valve job is very important here, as well as using a 12° back head valve and a 30°-33° back cut.
Personally, unless you just cannot scrape together a thousand bucks, I wouldn't use the E7's . Almost any head on the market aside from fords replacement crap will make upwards of 40HP right out of the box.
Brian

</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR></TD></TR></TABLE>

Wow.. that is the best reply I've seen yet on pinch porting.

ahhh.. I know why. I recognize you from Speedtalk.

<font size=-1>[ This Message was edited by: Boss50 on 4/9/07 12:42am ]</font>

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