I read about it years ago in one of the rags, but I think it placed the rocker arm contact slightly off center and at an angle to the valve stem - that put slight lateral pressure on the valve and ultimately the guides. The article was pretty techy but it sounded convincing. Honestly I ran 1.7's in all but one of my 5.0s and never had any problems (30K miles at the most).. Once I read the article I stopped using them and just used the cam to get the lift I wanted. It was never because I actually dropped a valve guide.
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2003 10th Anniversary Cobra Convertible
All Stock and staying that way... well maybe some pipes since it's so quiet..ahhhh! it's a sickness
1995 mustang GT vert - all black (almost back together)
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