1970 marked the single year every American manufacturer went all-in on horsepower at once, from Chevrolet’s 450-horsepower LS6 Chevelle to Buick’s torque-monster GSX Stage 1 — output figures that still define the collector market today. It also happened to be the last year before insurance surcharges and emissions rules started pulling that horsepower back down. This video traces exactly what made 1970 different, and why nothing since has matched it.