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I`ve seen in several cases where the rockers have to be clearenced so they don`t make contact. Usually a carbide cutter was used then checked and rechecked until enough clearence was created. Usually the contact shows up during the mock up assembly and all the rockers are checked. But I suppose it could have occured at a upper rpm blast. I can`t say I have heard of engine works stuff so I can`t give a opinion on them.
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