sure sounds like the block has been lined honed quite a few times for the crank to move that much up, or whomever did it didn't do a good job, time for a new block buddy.I'm going to assume you didn't read the whole thread? If you had, you would have seen that we already purchased the smallest chain we could find. It is still too loose. I've been building these motors for 20 years. I'm well aware of the issues/carnage the stock chain tensioner can cause.