Okay, so i have been searching for about 3 hours now looking for the best d-series head and block combo. I've searched all over; on this forum and a whole bunch more and i just can't get straight forward answer. I heard that the z6 block with the y8 head is the best. But Then i Heard the jdm d15b is the best D motor. All of this is so confusing. Thanks ahead of time for any help given. its greatly appriciated. PS. IM NOT GOING B-SERIES SO PLEASE DON'T REFER IT!!