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The Rarest Pontiac GTO Muscle Cars In The WorldThe standard 400 cubic-inch V8 produced 350 horsepower ... It's no surprise that people looking to buy a new GTO opted for the High-Output engine, seeing as you get an extra 50 horses straight ...
A GTO with the standard, puny, 400 cu. in. V-8 removed and the full, top-of-the-line 428-incher inserted—with enough fiddling inside the replacement engine to bump the output up some ...
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