My valve guides were toast at 70,000 miles. It smoked on de-acceleration more than at any other time. The exhaust guides were much worse than the intakes so the plugs looked pretty good. If you do most of the work yourself, it will cost around $4000 max.
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87 Carerra Coupe
04 GMC Yukon
07 Mazda 3
00 GMC Sierra
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