Found an interesting article by Super Ford on 5.0 mods, it's back from 1996. It's a few pages, but I'll just get to the meat and potatoes.
PHASE 1
Peak Hp
Peak Torque
Baseline
201.7@4300
261.2@3700
Remove silencer
206.2@4700
265.2@3700
K&N filter
207.3@4700
265.2@3700
Underdrive pulleys
217.4@4900
278.8@3800
SplitFire plugs
218.9@4800
278.5@3700
1.7 rockers
223.2@4700
281.6@3700
PHASE 2
Mufflers
227.9@4900
285.1@3600
Short-tube headers
227.6@4900
282.9@3600
75mm air meter
230.8@5000
288.1@3700
Equal-length headers
231.9@4900
287.4@3800
PHASE 3
GT-40 intake
238.6@5200
285.3@3900
Steeda module
248.8@5100
291.6@4000
PHASE 4
GT-40 heads
272.4@ 5000
308.9@ 4000
24 lb. injectors
275.6@ 5100
310.6@ 4000
Suposedly the mods were done systematicaly and started with phase 1, then ended with the GT40 heads. Interesting writeup, if anyone is interested, I can PDF the whole thing and link it or something.
PHASE 1
Peak Hp
Peak Torque
Baseline
201.7@4300
261.2@3700
Remove silencer
206.2@4700
265.2@3700
K&N filter
207.3@4700
265.2@3700
Underdrive pulleys
217.4@4900
278.8@3800
SplitFire plugs
218.9@4800
278.5@3700
1.7 rockers
223.2@4700
281.6@3700
PHASE 2
Mufflers
227.9@4900
285.1@3600
Short-tube headers
227.6@4900
282.9@3600
75mm air meter
230.8@5000
288.1@3700
Equal-length headers
231.9@4900
287.4@3800
PHASE 3
GT-40 intake
238.6@5200
285.3@3900
Steeda module
248.8@5100
291.6@4000
PHASE 4
GT-40 heads
272.4@ 5000
308.9@ 4000
24 lb. injectors
275.6@ 5100
310.6@ 4000
Suposedly the mods were done systematicaly and started with phase 1, then ended with the GT40 heads. Interesting writeup, if anyone is interested, I can PDF the whole thing and link it or something.