K20a2/ k20a3 blocks Is there any major dif. involving both of these. I am talking just the blocks. As in would a K20a2 block be a more sensible choice in sleeving more than the A3? The A3 are so low cost to return by so I just planned to know. https://13bengineandtransmissionf51503.blogminds.com/everything-about-lexus-isf-5-0-v8-2ur-gse-full-engine-29915029