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Old 07-19-2013, 03:54 PM
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You have to mill down the outer diameter of the valve guide boss to accept the positive valve seal. Also the new seal is going to require more clearance (the valve spring retainer will hit it). So for a low lift factory cam, maybe not a big deal. But with a higher lift aftermarket cam you might have to cut the valve guides for clearance. Either way you gotta check it. I believe Crane and Comp Cams make cutters for this and you can do it at home. But if it was me I would cough up the bucks and let the head shop do it.
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