I thought as much... I 'll probably end up doing both heads. What I didnt think i'd have to think about was welding up the corrosion! I did an aluminium head on a different car, and that didnt have any noticable pitting, and after it was decked it was spotless. I guess I wont know until I pull the heads.
Whats the likelyhood of having to helicoil the head bolt orifices in the block?

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Ben

'85 500 SEL
'85 928S2
'88 560 SEC
'90 750i