[SFfiredog]

here are flow numbers for CNC ported Blue Thunder heads

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ET Performance cylinder heads does a good portion of the CNC heads available today.
Here are some flow numbers for a relatively mild CNC port on the BT standard port medium riser heads.
All numbers are @ 28" Water and are with a 2.19" intake valve and a 1.65" exhaust valve. with a 4.35" test bore.
intake
.400" 274
.500" 313
.550" 327
.600" 333
.650" 340
.700" 341
exhaust
.400" 191
.500" 215
.550" 223
.600" 229
.650" 233
.700" 237

The low and mid lift flow numbers are excellent and the high lift numbers are very good. The velocities are excellent and the port volumes are relativly small. And the numbers on the exhaust are made with a small 1.65 exhauast valve.
This would be a great street head that would still make big numbers on the track.
I can't wait to see the race heads.
Information gathered at the PRI show last week.
Happy holidays,
--Mike

Superformance Cobra replica
504" all aluminum tunnel port
'01 SVT Lightning