anyone have ideas on stock flow numbers on the 4v cobra heads?

 

These are the flow numbers on a 99 up 4V head we took on our 1020 Superflow a few weeks ago. We are currently working on a 4V program.

.100 91/73
.200 154/114
.300 201/147
.400 219/166
.500 230/172
.550 233/174
.600 235/175

Also, here are the PI 2V numbers you were asking for, once again, these are off of our 1020 Superflow.

.100 53/50
.200 108/89
.300 145/130
.400 168/145
.500 176/158
.550 181/160
.600 183/161

 

Just found flow numbers on the new Hemis. Both 5.7 and the unreleased 6.1.

5.7 hemi head flow
intakeflow
100-75
200-169
300-241
400-273
500-281
600-286
exhaust flow
100-41
200-107
300-146
400-163
500-169
600-172
6.1 hemi heads flow
intake
100-85
200-174
300-246
400-290
500-310
600-318
exhaust
100-42
200-111
300-160
400-179
500-179
600-179

 

good link to stock and stage1-3 late model ford heads. click on the bench picture.
http://www.mustang50magazine.com/tec...ad/index1.html