Ported 906 Heads

The springs and retainers are new and good for .525 lift, the ports measured close to 86cc so they do not appear to have been milled. The heads flow as follows:

Before Intake Exhaust
.200 137 88
.300 199 126
.400 223 147
.450 223 154
.500 218 158
.550 210 160

After Intake Exhaust
.200 120 100
.300 200 146
.400 250 177
.450 269 185
.500 279 189
.550 281 190

Mike