John Retzloff 1977 Gmc K15 Engine Shot
John Retzloff 1977 Gmc K15 Engine Shot
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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. Read Article
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