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GM experimented with DOHC designs and stuck with cam-in-block for a reason. These reasons have been detailed again and again and again, but suffice it to say when you have a 450# motor complete from manifold to oil-pan that will make over 500 horsepower and pass emissions, you have a winner. Now consider that it will produce over 500 horses at the TIRES with exhaust and a mild cam and a tune.
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Actually GM didn't do anything other than hire Lotus to do all of the engineering and design for the LT5 if that is what you're talking about??
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