NISSAN SKYLINE ENGINES FOR DUMMIES

k20a2/ k20a3 blocks Is there any big dif. among these two. I'm speaking just the blocks. As in would a K20a2 block be a better choice in sleeving more than the A3? The A3 are so inexpensive to return by so I just needed to know.For that cylinder head This is a true RBC cylinder head Using the lost motion castings set up wanting to swap in excess of