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Thanks for the info everyone. To make a long story short, the engine got revved up to 10,000 rpm for several seconds and immediately therafter had a tapping noise. When I pulled the valve cover I found 1 rocker had about 1/8" play and the top of the valve flush with the retainer. The rocker looks good. Is there a split ring washer which holds the valve in place?



The valve locks at the top of the valve look like two half-circles. When you compress the spring with force on the retainer locks will be visable and easily removed. Interesting what happened--are you thinking just the valve stem was destroyed? I am surprised the rocker looks good. Or did the lock fail? Doesn't sound like wiped lobe simply because that wouldn;t explain the top of the valve being flush with the retainer.