Why exactly do you want a 5.4 3 valve? As you can see, billfisher only made 250rwhp (granted about 30 more TQ than the 4.6), where as I've seen plenty doing 300rwhp with minimal mods on the 4.6 2 valve.
reasons you are wrong...
no.1 minimal mods yield ~255rwhp and 290ish rwtq with a
MANUAL TRANSMISSION. minimal being every bolt-on.
no.2 300rwhp from a bolt-on 4.6
REQUIRES cams. that ain't minimal
no.3 i have no real bolt-ons. that's 90 percent stock numbers.
no.4 with a manual tranny the 5.4 3v's numbers WILL be 270rwhp and 350-360 rwtq with the same setup as me. and with longtubes, cams, water pump, windage tray, exceed most 4.6's except 4v's.
no.5 your heads flow hardly any air. and ported your PI heads still fall short.
no.6 my theoretical max HP number is ~467 flywheel hp without head porting.
no.7 that little 40 rwtq a near stock 5.4 3v makes over a 4.6 means 2 to 3 cars on it in the first 100 feet.
no.8 i rev 5500 and use 3.90 gears, so 4.11's in a 4.6 is no real advantage.
no.9 a 5.4 3v can be forged to rev 7200 and has airflow to support that.
ets, etc, etc....
i mean no insult to anyone. i love 4.6 2v's. but he asked why, so i answered.
oh and stock 5.4 3v's with mild boosted ~8lbs make 425rwhp/450 rwtq.
rafael naves is making 540rwhp/570 rwtq with his in break-in tune. He broke 2 Jasper monster box tranny's in a row rith the torque he expects to exceed 700 rwhp in pump gas. Call JDM engineering for more info on RAFA's truck.
so, a 5.4 3v can approach a gt500 in power with the right mods. Rafa's hp is in fact greater than a gt500.
5.4 4v is king.
4.6/5.0 4v is next
the jury is out on 5.4 and 4.6 3v but 350rwhp is average for 4.6 3v with bolt-ons and cams no head porting.
4.6 2v is low man... no offense.
