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unlike the larger EcoBoost engines—cast iron has been selected for the block, reducing the amount of energy needed for warm-up by up to 50% compared with aluminum.
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I wonder how the weight of the cast iron block compares to aluminum, I would think that with modern casting and modern alloys that they might not be that heavy, just like steel bike frames can weigh about the same as aluminum because aluminum can not flex very much without cracking.