I know the y8 head is just plug and play but at the time I was looking for one I didnt find any they only thing I could find was the z6 head. And yes I used the y8 head gasket and the head bolts were torque down correctly to factory specs from a z6 correct me if a I am wrong step 1 - 22 step 2 - 53. Also gave it a couple of extra lbs of torque cuz I used the same head bolts didnt get new ones