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From those marks, Kertz knows exactly where to drill out the holes so the plate fits like a glove. Note that he also cut out an oval for the timing chain. Once he has the holes drilled, the plate slides into place on the engine to verify fitment. It’s also a good idea to have your accessories on hand to verify clearance; that scallop on the left-hand side of the plate is to clear our Aviaid dry-sump pump.