My block is about 3 years old. It dyno'd just under 900hp but, doesn't have a lot of run time on it yet due to some issues with the block and some issues with my heads. I just got back together but, it looks like mother nature isn't going to work with me this year. My issue was with the block was oiling..... The first go round it cost me a rotating assembly and ended up with 2 sleeves. Bill did work with me and covered the block repairs. I had to buy another assembly and bumped the cu in to 572 since I had bought a good flowing pair of 440-1's. Before going back together we ran gun drills thru some of the oil passages because we found they weren't intersecting that great. She's oiling great now. The block is a nice piece otherwise. Just like I was told on here. You have to have someone knowledgeable go thru the block good before assembly.