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Metal Fatigue, improper heat treat or fit. Pick your poison.......
Rick
PS: Just an afterthought. The valve stems should have a very small chamfer on the end. If this is lacking the sharp corner could cut into the fillet machined in the recess of the lash cap creating a stress riser inside the cap itself.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 02-24-2003 at 11:17 AM..
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