Im a noob so need answers. I seen other pics but can i put like a b16 head or zc or ls head on like a d16a6 which is a si will it work and is it easy or is there like any difference in swapping a regular head?

 

Nope, B series heads (b16,b18,etc.) will not fit on D series block (d16,d15). A more appropriate choice for the a6 block would be a d16z6 or d16y8 head. If you use the search fucktion at the top and search around for mini me info, you will find plenty. Be sure the click the "archived content" box when you do, good luch