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I think where Dodge saved a lot of money is that the Hellcat motor is not a 100 percent from the ground up new motor. It has design elements from the old 6.1 and current 6.4 motors. The parts are new, but the designs are old. For example apparently the block is based off of the old 6.1 Hemi while the heads are based off of the 6.4.
I think perhaps the best analogy I can give is how the LSA is related in design to the ls3 and ls9
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