so im rebuilding d15b7, and i've been searchin around the site researching putting a vtec head on it. i've found a lot of info about using a z6 head, but does it work the same with a y8 head? i read the diy about using a z6, do i follow the same instructions with a y8? the reason why i ask is because i found a y8 head for cheap, or else i would just use a z6. thanks.