GT 500 head flow?

[acmsheva7]

Anyone know the chart of the stock GT500 head flow ? I´ve been looking but can´t find it yet ! :shrug:

thanks in advance

 

[03TrchRedCobra]

This should be it


EXHUAST

.50 40
.100 89.6
.150 132.5
.200 168.5
.250 193
.300 212.5
.350 223.5
.400 231
.450 245.2
.500 240.5
.550 245

INTAKE

.50 43
.100 90.8
.150 131.3
.200 169.1
.250 203.5
.300 234.3
.350 257.7
.400 274.3
.450 284.4
.500 290.6
.550 294.6

 

[Fourcam330]

Those numbers are low. They flow around 310/255cfm @ .500" lift stock.

 

[meaty mac]

Those numbers are low. They flow around 310/255cfm @ .500" lift stock.

Hey Fourcam, as long as we got you here, can you tell me if the GT500 and Ford GT share the same head? thanks.

 

[me32]

Hey Fourcam, as long as we got you here, can you tell me if the GT500 and Ford GT share the same head? thanks.

yes they do, but the use different cams and springs which ford racing sells and adds more lift

 

[03TrchRedCobra]

hmm those were the Ford GT flow numbers i had, i forgot the GT500 had different cams.

 

[Fourcam330]

Just like differences in dynos and dyno procedures can factor into testing, cylinder head flow tests can be affected by a multitude of things. Your numbers could indeed be accurate from the bench they came from, but 310/255 is more on par with what the aftermarket sees on avg.

Yes, GT/GT500 castings are identical.

 

[meaty mac]

Thanks guys :beer:

 

[Darren5.0L]

A continuation of the above, Fourcam, could you provide your flow number throughout the lift range? These are very interesting numbers when compared to the Sean Hyland book I have on hand, which only rate the Navigator and 2000 Cobra R heads.

For the sake of discussion the number SH lists are:

5.4L 4-Valve Tumble Port (Navigator)

INTAKE

.50 47
.100 95
.150 127
.200 153
.250 177
.300 193
.350 207
.400 211
.450 215
.500 218

EXHUAST

.50 38
.100 73
.150 98
.200 117
.250 132
.300 143
.350 148
.400 151
.450 152
.500 153


5.4L 4-Valve Cobra R
INTAKE

.50 42
.100 85
.150 117
.200 150
.250 181
.300 210
.350 233
.400 248
.450 259
.500 268

EXHUAST

.50 36
.100 73
.150 108
.200 136
.250 165
.300 183
.350 192
.400 199
.450 201
.500 206

Tested on a Super Flow SF600 flow bench at 25.00" water with 3.570" bore size.

So as anyone can see, the Cobra R heads really out do the Navi heads in the upper lift values, I am now very interested to see how the Ford GT/GT500 heads have improved over these.

 

[Fourcam330]

Industry standard is 28", I have no idea why Hyland did that with his heads...

Darren,
I'll have to dig for them. I had Fox Lake flow a spare stock set for me years ago. I'm not even sure where to look at this point...

As for a difference in flow between Rs and GT/GT500s, there isn't much. The port is raised .02" but everything else is pretty much the same. Both need work in the bowls, short turns, and better valve jobs. After porting they're identical.