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Factory valve guides are one size, over size, the are intended to be machined down to fit the hole. You measure the hole in the head and turn the guide down on a lathe, I think about .003 larger than the hole (there should be instructions in the manual). Other types of guides sold are by the size. You need to first remove the old guide then measure the hole in the head then you can determine which size you need. A guide to big can crack the head at the guide hole, to small and it will come loose under use.
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