Ok my plans have changed for my build and I will be going with a Y7 head. Now my question is head studs. I see that they make custom kits for mating different heads to different blocks. But there for the Y8 head and the guy on the phone said something about a vtec solenoid clearance. But they only make the head studs for all the y motors there is no difference between vtec and non. So Im inclined to think that the z6/A6 to y8 headstud kit would work with the Y7.