so chris my names Noah i got the teksid block going with the mmr sheetmetal intake and aeromotive fuel system but what heads do you think i should go with? I've heard a 5.4 head will bolt up and flow like crazy but you seem to know alot about the 4v heads any suggestions or knowledge of the 5.4 heads?
hello Noah.
There are indeed heads that are intercahngable with the 4.6 and 5.4L applications. One example is the FRPP 2v PI heads
http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=6124
another being the 3v FRPP head
http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=11925
and finally, a third exmpale is the latest production heads for 03/04 cobras and mach1s (4v)
http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=10703
If you have a set of 4v 5.4L heads, id be more comfortable telling you about them if you tell me what they came out of...
for example, the Ford GT heads use an updated version of 00Cobra R heads, and the Cobar R and the GT both use seperate application-specific cams. Also, some people (MMR included) suggest using custom-to-application intake manifolds with ford GT heads.
some people mention the requirement of "minor" modifications to the 5.4L heads to make them fit on a teksid. I beleive its something as simple as grinding off a bolt-mount, and using the proper intake manifold gasket. (but im going off memory there.)
Overall, the applications of 5.4L heads to 4.6L blocks seems to be pretty universal and easy to do.
as for the intake that you have,
you will need an intake for the 5.4L heads. if you have the "b head" intake "bread-box" design offered by MMR, it will only fit on "b heads" (1996-1998 cobras or simular) the first 5.4L heads offered (1999 lincoln navigator) were tumble port design.
If you want to use that manifold, i suggest a B-head set up with a turbo (if possible. :-D lol)
Also, aeromotive makes a great product, but the only thing i do not agree with in their "philosophy" is snake-routing your fuel system. (as seen on many applications) This is when you feed the back of one fuel rail, then plumb the front of that same fuel rail to the front of the other side's fuel rail and send the return out the back of the opposing rail. (you may recall seeing fuel lines going over superchargers on 03/04 cobra set ups and OEM shelby cobras)
Obviously aeromotive is highly reputible and even Ford does this, I have aeromotive products on my car as well, but i just prefer to feed both rails and drain both rails.