Definitely Y8. I'm sure everyone here will agree with me on this one. It has smaller combustion chambers for higher compression, and it also has quench pads, which help against detonation. Not sure how the head flows against the Z6 tho. Besides, the Z6 has the red-headed stepchild distributor....won't be able to bolt an obd2 dizzy up without modification to the legs.
The head doesnt flow as well as the Z6 because its biased towards economy; but that can easily be fixed with a port job and in the end itll be better or as good as a welded Z6 head.
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