The 1949 Oldsmobile 98 Holiday paired a landmark body style, one of the first hardtop coupes GM ever built, with only 3,006 produced, with an engine that changed the industry outright: the 303-cubic-inch Rocket V-8, the first mass-produced overhead-valve V-8 in America. Together they cut 10-to-60 mph times by 4.6 seconds over the prior year’s car and helped kick off the horsepower race that would define American muscle cars for decades to come.