NG head on an MC, w/ex. valve transfer?

[auditude at cox.net]

JShadzi at aol.com wrote:
>
> Ken, the NG head is VERY different than the MC head, thought I addressed this in an email to you yesterday...

Hi Javad,

I had forgotten about the injector location difference at the time of my post, but I don't have an email from you about that.  Not in the past week or so anyway, as my incoming mail is still on the server, I think.  It's possible tho', as I have deleted some of it.  Sounds familiar "now".  I also realized it from reading the thread as it progressed.

> The NG head uses elongated intake ports because the injectors are in the intake manifold NOT the head, which forces you do use the NG intake manifold (my reference to redoing the intake plumbing).

Yeah okay, so the intake ports look sorta like a 20v head then, right?

> NF head uses the MC style casting with the bigger valves, injectors in the head, etc.

Okay, I gotcha.  Both heads have the same types of valves, but only the NF head has a compatible casting to the MC type of intake manifold.

> Valves are interchangeable FWIW.

Is there enough meat on the 38mm seats to machine them to take the 40mm valves, or do the seats need to be changed out?

Thanks,

Ken

> >On a separate tangent, I know that the NF/NG heads have 40mm intake valves, vs. 38mm
> >versions in the MC heads.  I thought it was a simple swap involving just replacing the NF/NG
> >exhaust valves with the sodium-filled ones from the MC head.
> >
> >But looking at this picture of and NG head, it looks kinda funky to me.  Like it's different on
> >the sides or something.
> >
> >http://www.audifans.com/marketplace/images/parts/3276.head1.JPG
> >
> >Are the castings different, or am I just not used to looking at an MC style head from that
> >angle?
> >
> >If they are different, is there anything that would preclude putting an NG head on an MC,
> >using the MC's exhaust valves.  The idea would be to get the larger intake valves.
> >
> >Or, do you have to get the bigger intake valves and install them into the MC head?