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I've heard of other potential problems with those Mike...
...they sometimes break off the rocker shaft mounting bolts, or misalign the valve setting because the nuts are torqued too tight...be careful
...becasue of their higher acoustical mass, they are quieter...a good thing
...the seals still don't always seal well...check the archives...this was discussed a year ago or so...convinced me not to get 'em
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