Aftermarket will definitely be expensive to start off just like everything is. The 4v heads are already really good from Ford so there is really almost no need for an aftermarket head. Trick Flow was smart with there 2v heads, but the cost to produce a 4v head would be much higher and there is much less demand for it. The stock 5.0 4V heads flow over 300cfm from Ford so it would be tough to make something better. Even the 03-04 4v heads after porting will flow 320+.
A really sick set of heads are the 00 Cobra R/Ford GT heads. After porting they will flow 370+/310+
I won't be at all surprised to see these new heads outperform those though. Ford has come a long was since the B heads and made a bunch of steps in the right direction as far as the modular motors are concerned.
Those old windsor based pushrod motors will always be a cheap way to make really good power though. Its hard to compete with the bang for buck on those.
Got this list off of Modular Fords. I'm thinking Livernois has a very generous dyno at there shop lol.
black2003cobra wrote:
Post up your results and mods. Please report SAE numbers, (and correction factor if you know it).
For those that have already put up their own threads, feel free to also add a link to your thread!
Stock, Manual:
Mike.B: 384/360. (avg of lower 2 of 3 pulls), CFsae = 1.092.
1Sick2Valve: 364/347. 5th gear pull. (355/343 hot).
JJ@WMS: 373/353. 3.73 gears.
Livernois: 378/361.
Stock, Auto:
ARH: 379/338.
SCT: 360.7/326.2 STD.
Livernois: 354/348.
Modified, Manual:
Livernois: 415/399. Tune.
Livernois: 430/410. Steeda CAI & retune.
1Sick2Valve: 369/350. xpipe.
1Sick2Valve: 384/368. xpipe + tune.
JLT: 393/372. JLT CAI, tune and 3" cat back.
JLT: 416/376. JLT CAI, tune and 3" cat back, ARH LTs.
Modified, Auto:
ARH: 411/354. LTs, hi-flo cats, x-pipe.
SCT: 376.4/356.2 STD. Tune.
Livernois: 375/365. Tune.
beefcake: 528.4/448.4 MD. Vortech 8.75 psi, SW LTs.
Don't know if you guys saw it. Strictly Performance already put one in the 9's. With only a C4 swap, upper/lower control arms, Bogarts, and a custom direct port 250 shot it put down 656 rwhp on the dyno and went 9.96@137 off the trailer.
http://www.musclemustangfastfords.com/v ... 0attn_3mPz
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Epic Text wrote:
Me wrote:
You want a dog for about two weeks? Said dog may or may not be in heat and bleeding on your carpet.
lol, no. Houston can stay at your house
, also evolution pulled 407 whp with intake, o/r x pipe, exhaust, and tune, but i cant wait to see how damn expensive the aftermarket is gonna be 
glad my 5.0 is cheap
