I posted this in the E34 thread but I might get more responses here so: I just wanted to throw this question out and see if it's possible. After discovering that I had a small crack in my cylinder head I had the hairbrained idea that it might be possible to swap the head out for a similar year M5 head. I can't find any size specs online so, is it possible? also, I've been quoted 12 hours labor on removing and reinstalling the cylinder head. I've seen some people around stating it's a two hour process. Is my shop hosing me on labor? thanks for any feedback!