head identification

[Chris Semple]

>>> NF heads are unique among 10v heads in that the intake valves are 
>>> 2mm larger
>>> @ 40mm. That's the easiest thing to find. Part numbers and casting 
>>> numbers
>>> are the same between MC and NG heads (I have both literally in front 
>>> of me
>>> as I type).
>>>
>>> -Cody
>>>
>>
>> Same intake valve in the NG 2.3L used in 80/90/100/GT. But yes, it's the
>> biggest OEM valves for an injector-in-head car.
>> NF castings = MC castings.
>>
>> -Cheers
>> -Chris Semple
>
> Thanks for the clarification. Is the NG head essentially the same with 
> the injector bosses not drilled? If one was making a custom intake 
> manifold (going ITB in my case) it would be trivial to include 
> injector bosses.
> -Cody

No, different casting as I recall, due to the port design for the intake 
manifold. Keeping the vac pump boss out of the equation for now, since 
that's cast, but not drilled out for all applications('89-'91 100).

-Cheers
-Chris Semple
Concord NH
'84 4000q
    '08 E350 Club
        '71 M-B Unimog 406