wondering.....why is he Y7 any better than the a6??? Supposedly its the same as a z6 head without the vtec but isnt the vtec head yeild a lower compression than the a6 head??? well what about the Y7 cam??? well if anyone could give me the downlow it would be helpful...THANKS in advance

 

the z6 on a a6 block yeilds higher compression due to the smaller combustions chambers just like the y7 head but only bad thing about the y7 is finding a cam or valve springs for it there are some but not more than 2 companies i think