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most machine shops can replace valve guides but i suggest you have them install the valve guide split sleeve inserts. they require less work and you do not remove the orignal valve guide. you drill old valve guide to a insert size and install insert then ream it to proper valve stem clearence and it takes far less material to cut valve seat plus it is still on its original center and the insert is far more superior than any replacement guide for wear. no cracked guide boss to worry about. contact dave coleman in west virgina by summit point raceway he has been repairing and racing porsches for 35+years a real grass roots racer with a no frills shop he has beaten a many of porsche high dollar racer he just does what works and you do not pay for a fancy name or shop. he does not try to reinvent the wheel. and is very afforable and resonable
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