so wats the best block to build for turbo?d16y8, d16z6(d15b) d16a6 or are there any other d-series blocks that are a good turbo build also is even worth saveing up to sleeve?

 

Dont worry about the block.. just build a d16 block.. The head is going to get you the power.. The block just takes it.. And for turbo? I, along with quite a few others, are rather enamored with the z6.. So I would say a d16z6..

 

i've been wondering about this myself, but how do the d15 blocks compare to the d16 blocks? are they the same casting just with a smaller diameter bore in the sleeve? is there any real advantage to using a d16 over a d15 under boost?

 

Cheap block + internals + Sleeves + 25psi =

 

Theres negligible difference in the blocks, your better off finding one in better condition.