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This is not your everyday small-block valvetrain, so a little massaging was required. Once mocked up on the engine, Urban discovered he needed to open up the passage with a grinder where the Crane 3/8-inch pushrods pass through the Chapman heads. Also, the Crower rocker stands and Crane spring buckets needed some grinding to allow room to tighten various head fasteners. This is a high-end valvetrain, but one that will easily handle 7,000-rpm run-ups and flow a lot of air/fuel, which is what I wanted.