Typically, the more valves that you have in each cylinder, the more air that the engine will flow, thus increasing the power of the engine.
For instance, the 4V engine in the Cobra has approximately 60 more horsepower than the 2V engine in the GT. This is due to the better flowing heads of the 4V allowing the Cobra engine to spin at higher RPM'S than the 2V.
Typically, the more valves that you have in each cylinder, the more air that the engine will flow, thus increasing the power of the engine.
For instance, the 4V engine in the Cobra has approximately 60 more horsepower than the 2V engine in the GT. This is due to the better flowing heads of the 4V allowing the Cobra engine to spin at higher RPM'S than the 2V.
A Cobra/Mach 1 4V swap should net around 60 hp over a 2V.
Scotty seems to have come across an adapter that allows swapping a complete, inexpensive, Lincoln 4V engine into a Mustang. There is some info about that swap in his Steeda build thread, in this forum.
I suppose that it is as straight forward as working on any overhead cam engine. I've never done the swap but I don't recall reading about anything that is too difficult about it.
If you Google "4V swap" there is a lot of information available about how to do it.
Look up 2V to 4V swap on google. Its a 95% drop in but its not as simple as just swapping heads. You also need to be able to properly degree cams or take the engine to a place that can do it for you.
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