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I just KNEW all of you haters of the concept would get your wish!  Looks just like the '69 you asked for...and they even left out the airbags for that truly 'old-fee' you kids were screeming for.  Great job GM. 

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it's a 454 w/ heads similar to the 427's and an LS block, among other things. 

At Warren Johnson’s dynamometer facility, the LSX engine produced 641 horsepower and 611 lb.-ft.  of torque.  More than the peak numbers, however, is the engine’s Kansas-flat power band.  The engine makes 520 lb.-ft.  of torque at only 3,000 rpm, with torque rising steadily throughout the rev range.