The Buick Gran Sport was the apex of performance luxury in its time. When equipped with the legendary 401 cubic inch Nailhead engine, the Gran Sport pumped out 325 hp and a whopping 445 lb/ft of torque. If that doesn't get the job done, we've made dropping in a Gen III/IV LS engine a bolt-in affair.

High-Horsepower street cars and trucks can be a challenge to keep cool. A proper cooling system starts with the right radiator.