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I am not a metalurgist, however, I can provide you with some valueable information here. for 396, 402, 427, and even 454, I think, they actually made 4 different crankshafts. A cast iron, and a steel, with 3/8ths rods, and the same with 7/16ths rods. The latter, in steel will be the strongest, and in the 427. and 454, from GM, redlined at 7000, and 6800, respectively.

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14y ago

What else can I help you with?