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Sherman had the new harmonic balancer "degreed" from 10 degrees after top dead center (TDC) to 50 degrees before. After degreeing-in the camshaft, he had to make a new timing pointer. He also marked in white: TDC, the pointer tip, plus 30 and 40 degrees before TDC. Exact engine timing is a MUST! It should also be noted that the 455 had the benefit of being dyno-tested with no pulleys or drive belts, per se. This can save 6-7 hp.