Out of the box TFS A heads 340 runner
I understand about the compromising part.. i never meant to sound like my demands were in stone.. just a ballpark. I am focused on the other three things primarily, which is why I was asking which cylinder head would be the best start. I may even step up compression a little and run better fuel. The afr heads seem great and all, but I can't see going with a head that requires a different intake, and not just stepping up to the a460. If the slate were clean, you would take the afr 315 over the tfs a460?
Airfl ow Results
PowerPort A460 340 with Standard Bolt Pattern
Lift Value Intake Flow CFM Exhaust Flow CFM
.100" 76 67
.200" 160 120
.300" 246 162
.400" 312 204
.500" 357 237
.600" 392 264
.700" 418 286
.800" 428 303
Tests conducted at 28" of water (pressure).
Bore size: 4.500"; intake valve: 2.350"; exhaust with 2" pipe.
AFR 315 Bullit heads.
315cc Street Head Flow Chart
.200 .300 .400 .500 .600 .650 .700 .750
Int 162 241 309 360 405 415 423 427
Exh 127 172 218 252 274 279 284 284
Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 4.380", 3/4" radius plate exhaust, 2 1/8" curved pipe
From a raw airflow perspective the AFR heads are on par with the TFS A 340 runner castings excepting the high lift exhaust numbers.
I sold both pair of P-51's I had purchased for personal projects after the AFR 315's showed themselves to be a better choice. The AFR heads are no joke let me tell ya.
What it really boils down to here is intake port cross section. The AFR 315 heads are 3.44" square.
A 598 peaking at 6800 is better suited with about 3.72" square. The TFS heads on paper are better suited especially the CNC ported 360 cc version. The larger and better exhaust port would lend itself to better high rpm power in an all out application. The higher intake port entry relative to the valve has advantages that go above and beyond simple airflow.
Since your original question was TFS vs P-51 I feel the A heads are a better choice given your criteria.
From a clean sheet perspective it depends on how much room you want to be able to grow. Given the cam duration it will take to generate the power curve you are after putting some compression to it is not a bad idea. It would help the torque curve everywhere under peak (street use at light throttle) and make a bit of extra power as well. I see no reason that a large high compression stroker with a solid roller and the AFR 315's couldn't get close to 1000 hp.
Carl makes a good point in post #10