A 1967 Chevy C10 wasn’t built to be fast – Chevrolet’s second-generation Action Line trucks topped out around 325 horsepower from the factory. That hasn’t stopped builders from transforming these honest work trucks into genuine muscle car rivals, some packing twin-turbo LS power well past 1,000 horsepower under bodywork nobody would suspect. Here’s how a humble half-ton became one of the truck world’s favorite muscle car disguises.