Here's a link to the before and after pics of a pair of 427 low riser heads I just got done doing.
http://w61.photobucket.com/widgets/d...=/h75/mxnaked/
Flow numbers: Intake
Lift Stock Ported
.100 63 72
.200 118 153
.300 167 210
.400 202 251
.500 218 267
.600 225 278
Exhaust:
Lift Stock Ported
.100 48 59
.200 91 112
.300 122 147
.400 142 173
.500 152 186
.600 153 191
This is on a Superflow 600 bench, 28" depression, 4.350 bore for both stock and ported numbers.
Stock was a 2.03 x 1.56 valve combo and 30° intake seat.
Ported is a 2.09 30° valve cut down to 2.06 and made into a 45° seat angle with a 30° backcut.
Exhaust valve is a 1.65 diameter, with 2 backcuts, 37° and 29°.
I thought for $400.00 this port job got it done pretty well...
Average gain from .100 to .600 lift on intake was 39cfm and exhaust was 27cfm! Not bad for $400.00 eh...??????
Brian
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www.immengines.com
<font size=-1>[ This Message was edited by: ou812 on 5/20/06 9:12am ]</font>
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