13B REW MOTOR FOR SALE OPTIONS

k20a2/ k20a3 blocks Is there any major dif. among both of these. I'm chatting just the blocks. As in would a K20a2 block become a better option in sleeving above the A3? The A3 are so affordable to come back by so I just planned to know.I have used Northwest Motors before and will continue to provide them with my small business. Generally excellent