The Trick Flow 2v heads flow better stock than the 3v heads. I do not have any numbers for ported Trick Flow 2v heads.
Stan
Trick Flow Twisted Wedge 2V
0.0
0.1000 - 56
0.2000 - 122
0.3000 - 173
0.4000 - 213
0.5000 - 233
0.5500 - 241
0.6000 - 236
0.0
0.1000 - 43
0.2000 - 96
0.3000 - 135
0.4000 - 164
0.5000 - 175
0.5500 - 177
0.6000 - 180
3V Stock Blow-By Racing Alum
1.330709
0.1000 - 77
0.2000 - 147
0.3000 - 200
0.4000 - 216
0.5000 - 223
0.6000 - 225
1.476378
0.1000 - 53
0.2000 - 98
0.3000 - 120
0.4000 - 138
0.5000 - 148
0.6000 - 154
3V Stock PowerHeads Alum
1.330709
0.1000 - 74
0.2000 - 146
0.3000 - 198
0.4000 - 217
0.5000 - 225
0.5500 - 225
0.6000 - 225
1.476378
0.1000 - 71
0.2000 - 119
0.3000 - 145
0.4000 - 170
0.5000 - 190
0.5500 - 193
0.6000 - 198
I didn't say the 3V heads were stock, I referenced P&P 3V heads.
BBR Stg 3 P&P 3V heads:
Intake
Lift----Stock CFM------CNC Porting CFM
.100-----77.1--------------75.3
.200----147.0-------------162.0
.300----199.6-------------228.3
.400----216.0-------------273.8
.500----223.2-------------283.6
.600----224.8-------------292.9
Exhaust
Lift----Stock CFM-----CNC Porting CFM
.100-----52.7-------------46.2
.200-----97.8------------104.3
.300----120.2------------135.7
.400----138.1------------163.2
.500----148.2------------177.0
.600----153.7------------189.6
Ported TF heads flow ~260 CFM on the intake side...
Last time I checked 293 > 260. But as Brian pointed out Livernois' 3V P&P heads flow over 300 CFM on the intake side.
The best 5.4L N/A 3V with BBR P&P 3V heads, BBR N/A cams and the ultra rare Australian 5.4L 3V intake Manifold with all of the bolt-on goodies is flirting with 390 RWHP. BBR built a N/A 4.6L( 284 CI ) engine with their P&P 3V heads/cam combo and the stock 4.6L 3V intake and all the bolt-on and made 427 RWHP.
The best attempt with a 5.4L 3V couldn't achieve 400 RWHP but we can get there with less flowing 2V heads...