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Big-block goodness, now propane-injected to make an estimated 350 horsepower. The 454ci Mark IV V-8’s internals have been left as they were at the factory, but it’s been aided on the exhalation side by a pair of Summit headers and a 2½-inch dual exhaust that feeds into a single Dynomax Bullet muffler with a 4-inch exit pipe. Three bed-mounted Optima RedTops (not shown) provide juice for the engine and ancillaries, and an aluminum performance radiator with dual fans helps keep the motor cool when the competition heats up.