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k20a2/ k20a3 blocks Is there any major dif. amongst these two. I'm chatting just the blocks. As in would a K20a2 block be a better choice in sleeving more than the A3? The A3 are so low cost to come by so I just wanted to know.The Aristo was all-around For less than fourteen brief many years (1991-2005), but its twin brother, the Lexus GS continues