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also, you can raise the valve off the seat with the cam and push around on the stem and see how much things move - a couple of my stems moved a large comparative amount - those were the "bad" ones. Replaced all the exhaust guides as I recall, may have replaced all the intakes as well. If this needs to be done you want to use the best possible shop, they should have all the correct tools and fixtures needed e.g. to cut the new seats and know what the best seals and guide material are. There is a lot to know. A good job here and you should be good for at least another 150k miles.
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Sold: 1989 3.2 coupe, 112k miles
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