[bmw] M30 Head questions

["Gregory Bradbury" <gregory891@xxxxxxxxxxx>]

I have an M30 (3 liter twin carb big six, i.e. Bavaria) engine on a Euro E12 
that I want to rebuild and improve.  One down side is a pre-1981 head, which 
means it would be smart to change it before it cracks  -- particularly as I 
intend to build an "improved" engine.

I have a line on a good, used head (1985 casting) which comes from an E23 
745i.  I am aware that the differences between a carb & injected head are : 
any injected head would not have the proper threaded holes to mount the 
mechanical fuel pump, the non-threaded hole for the pushrod, larger exhaust 
studs and (possibly) different valve sizes.

Does anyone know of other (possible) issues or challenges using a turbo head 
on a carb (or non-turbo injected) M30 engine?  The price is just too good to 
pass up, unless there are some serious obstacles.

TIA,

Gregory in Geneva

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