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Shimming the cam tower will cause the adjuster foot to be offset slightly on the end of the valve. I guess a small offset would not cause problems. Are you lowering the deck height that much? It's common to shave the heads up to 1mm and shave the chain boxes to match. More than that and the chain gets to long. Are you going furthur than 1mm?
-Andy
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72 Carrera RS replica, Spec 911 racer
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