Right,

Thought i would have a look at the standard heads (mfi) match with a standard inlet manifold (mfi) and was shocked at how bad it was!







The next couple of photos show the difference in initial port shape between mfi and efi





The difference on the face is obvious, however what is less obvious is the subtle port shape difference behind the valve, the mfi head is fairly smooth etc, the efi head has quite a sharp angular lip on the inside edge of the port behind the valve, i think this is to promote swirl etc, but will get some good shots when the valves are removed.

Another observation, the bare castings are fairly different too, the mfi head seems to have been of higher quality, with less flashing and defects, other than the ports they seem identical, the efi inlet ports are also 1mm larger across....

Rob,