k20a2/ k20a3 blocks Is there any big dif. involving both of these. I am chatting just the blocks. As in would a K20a2 block become a better choice in sleeving in excess of the A3? The A3 are so low-priced to return by so I just planned to know.through bay2car One more trouble to look for is that each one the electronics are adequately Performing. S