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Try not, Do or Do not
Join Date: Apr 2004
Location: Fallbrook, Ca. 92028
Posts: 14,261
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Use them as they are. Heat was the problem with the 2.7 guide as much as the material. The use manganese, silicon and beryllium has made the new guide material is better, but when ever you change a valve guide you risk miss aligning it to the seat. You can always recut the seat, but why?
As stated before most of these older car will never see 50k miles and the original guides will easily last that long.
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