That type of valve problem is caused by the type of engine oil being used. Those engines are very prone to carbon buildup on the exhaust valve stems. When put under a heavy load the valve temperature will increase causing the valve stems to expand. The carbon on the stems causes the valve to hang open a little and the combination of the valve head temperature and the oxygen in the fuel mixture leaking out past the valve on the compression stroke has the same affect as cutting the valve with a torch. The solution is to use the later style valve stem seals and, most important, to use a low ash oil.
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Today's Featured Article - The Day Tractor Lovers Dream About - by Angus Crawford. The day started at five o'clock on the morning of Friday, the January 29, 1999. My father, my sister, my uncle, my cousin and myself all climbed into my uncle's Toyota van. It was six thirty in the morning and we had a long day ahead. We traveled for six and a half hours to our destination - a little country town with a population of no more then one hundred and fifty people (57 of them being children under the age of thirteen). We arrived hoping to meet up with a man we knew had over one
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