It sure does after spending the best part of $20k on the engine expecing it to last years, and not even getting 200km. I hadn't even hit the rev limiter yet.
I've have had it in elsewhere being fixed and had the whole lot checked over to make sure there is nothing else expecting to create an issue. New valves(all had been ground down too much to use), springs and retainers, a set of platinum roller rockers and pushrods were all needed + labour. I know failure can happen unexpectedly but this was 100% builder error and he's blamed everyone from me, to the dyno tuner to his old machinist. I could've bought a set of dash 3 heads with this wasted money! Hopefully it doesn't end up in court.