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I am sure Rob is correct in saying the Crane is dead on GM specs. I have talked with a couple of people that told me that Crane was licensed or had authority to build cams to exact factory specs while other companies couldn't. I don't know how true this is but I would think that Crane may have been the company building the GM pieces that were available at one time.
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Crane made all the GM Performance Parts cams - wonder where GMPP will go for them now?
