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A real miss should show up as a misfire code, usually P0300. Maybe it has a small exhaust leak that sounds like a miss. You should have somebody here look at it or listen to it. The LT4 cam isn't overly radical but the rockers can get noisy depending on what they are.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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