cryptic attitude? I've clearly stated what I believed many times over and people want to argue with me. I did not design this engine, I'm the guy that is diagnosing fixing when others have failed. Our shop has done over 20 cars now that have jumped teeth, as I said the early ones had broken guides so I assumed the guide piece caused it to jump. We have now seen many that have jumped teeth and the guide is ok so I re-assed my thoughts, and believe it is from hard acceleration in lower the lower gears followed by shutting the throttle hard. I have a car in the shop at the moment that bent all the exhaust valves, when I quizzed the owner about the scenario, it was exactly what he had done. I stated that the pic does not show things good enough to see if the timing is correct, I'm also not going to tell somebody how to fix their car unless I know 100% what is wrong, if they go and do what I say and it was not right rectification then it does not look good. Not all of us have money to throw at people to fix it?? I've got a business to run, I earn my money from actually working on cars, not a consulting business, I try to help where I can, I don't have people throwing money at me for the help I give do I? If somebody else has an opinion on what causes it, feel free to speak up, that is all.