k20a2/ k20a3 blocks Is there any major dif. amongst these two. I am talking just the blocks. As in would a K20a2 block certainly be a better choice in sleeving in excess of the A3? The A3 are so low-priced to come by so I just wanted to know.You'll be able to "Incorporate To Cart" to safe the engine promptly, or fill the the form for any inquiries.