I emailed portflow a week back or so, was curious about head flow numbers for the Honda heads...

At first they told me they could not give out this information, and told me it's 100/hr for a head flowchart. I laughed.

Then I got this email from them (pardon the headers)

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From: "info" <info@portflow.com>
To: "Jeffrey Cain" <x@x.com>
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Subject: Re: Head flow charts
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Status:

maybe this will help you out

here are some flow numbers from a
GSR head with std. valves. @ 28"
81mm bore
air temp 85

intake
lift cfm
.050 44.6
.100 84.0
.150 118.6
.200 150.0
.250 183.4
.300 212.6
.350 237.2
.400 255.3
.450 267.1
.500 279.6

exhaust
lift cfm
.050 34.6
.100 70.2
.150 110.9
.200 150.4
.250 175.8
.300 188.4
.350 194.7
.400 197.3
.450 198.5
.500 202.9

----- Original Message -----
From: "Jeffrey Cain" <x@x.com>
To: <info@portflow.com>
Sent: Friday, January 28, 2005 4:25 PM
Subject: Head flow charts


> My friends and I are having a debate on a local forum
> (www.tamparacing.com) and we cannot seem to find, consistant flow charts
> between the B series heads.
> I was curious if you could help me out, by showing me a few stock flow
> charts from any B series heads you've done. Im curious what they do
> stock. The LS, the B16 and the B18C(gsr).
>
> Any info would be apreciated
>
> Thanks
> Jeff Cain
>
>

 

Feel free to use this post as reference for the future.