Chevy never built the 1972 C10 to be a performance truck, but drop 400 horsepower under that long hood and you’ve got a genuine sleeper that can embarrass plenty of period muscle cars. This short-bed Fleetside represents the final year of Chevy’s second-generation C/K design, now wearing a whole lot more attitude than it ever left the factory with. Here’s why these unassuming work trucks have become such a beloved hot rod platform.