When you build an engine you don't install inferior parts to save a few bucks cuz it,ll bite you in the ass. Bad setting of the valves, your joking right, that engine was put together by some very top notch Aussie builders who've built some very fast Xs's and the only reason why they used mikes valves cuz they were donated. Have you ever had a Miksxs valve in you hand,CHEAP CHEAP CHEAP. If you don't like my comments the best thing for you do is just hit the ignore button. Chineses sandwiches don't think so ,we buy our bread from a local bakery made in the USA with USA flour or we bake our bread.