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You will be doing this again sooner rather than later if you don't do it now. The 84-89 Carrera's are well known for valve guides going well before 100,000 miles. Mine were shot at 88,000. Per Steve Weiner that phosphorus bronze is what they are made of except they are harder than the Porsche valve stems. Are you replacing your exhaust side cylinder studs with steel? BTW the heads look great.
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Michael
88 911 Diamond Blue CE Carrera 3.4 HC3.4 member
2020 Honda Passport
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