3 valve head info

Rather than one 1.76-inch intake and one 1.41-inch exhaust valve like its '99 PI predecessor, the new Three-Valve head (bottom) features two 33.8mm (1.32-inch) intake valves and a single 37.5mm (1.47-inch) exhaust valve. According to Ford, the use of twin intake valves not only improves engine breathing, but it also improves the mixture of air and fuel prior to combustion

Click to expand...

Jon is really excited about the raised intake and exhaust ports. He says there is more potential to be found in these heads,

Click to expand...

And when we say the 4.6 '05 Mustang and the 5.4 '04 F-150 share the same cylinder head, we mean the same cylinder head, right down to the camshaft and the part number

Click to expand...

Carls says these heads should easily support high-300 to low-400 hp at the wheels with the right bolt-ons

Click to expand...

351CJ said:

Thanks for the link 2k5pony, a great article!
Real #'s not speculation! That's what I like.



I like this too:

Those exhuast ports remind me of the Cleveland exhaust ports.


And for the person who thought I was blowing smoke when I said the 05 Stang GT and F-150 5.4 used the same heads:


Or how about this quote:


And the all important intake flow #'s (all stock @ 0.500 valve lift):

99 Cobra 4V: 248 cfm
99 GT 2V: 179
05 GT 3V: 235

So the '05 3V intake flows only 5% less than the 99 Cobra 4V and 31% better than the 2V PI head!

Click to expand...