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There's a saying in the hot rodding world: There's no replacement for displacement. The GM Performance Parts Chevy Silverado embodies this mantra, as this thoroughly modern truck has received the classic hot rod heart transplant - a larger engine. Out went the stock 5.3L V-8 and in went a GM Performance Parts (GMPP) LSX 7.4L - that's 454 cubic inches - fuel-injected crate engine that pumps out 640 horsepower. It was built to demonstrate the possibilities...Read.