The last time I taked to Ken at the MATS a couple of years ago, he told me that the aluminum blocks in a 572 were only good for a few rebuilds. He was also telling me that their 655 and 604's along with their 572's were only good for 50 passes and the needed to be gone through. I have a World block and I have 2 KB's. They are both nice, but I don't have any real experience with tghe Indy. They have pizzed me off so bad in the past, I wouldn't want to put any money in their pockets. Nothing with you Bob, and I have heard before to deal with the Indy dealers, if you want their stuff. Oh....and the reason I asked Ken about the block, is because a freind of mine had one that had gone soft. I am using it for a mock up block now.