K20a2/ k20a3 blocks Is there any major dif. among these two. I'm speaking just the blocks. As in would a K20a2 block be a better option in sleeving over the A3? The A3 are so low-priced to come back by so I just planned to know. True warranty. Any issues https://landendhhge.theideasblog.com/32987112/the-greatest-guide-to-rb26dett-motor-for-sale-toyota-4a-ge