MOTOR RB26 OPTIONS

k20a2/ k20a3 blocks Is there any key dif. involving these two. I am speaking just the blocks. As in would a K20a2 block become a more sensible choice in sleeving above the A3? The A3 are so affordable to return by so I just wanted to know.So magnificent! this was my Blue Funco in the pictures. I built it although finishing a long run chassis improv