Buick Hot Rod, Street rod or custom for sale. Buick is the oldest American marque still active, and is known for its iconic V8 engine, nicknamed the Nailhead because of the vertical attachment of the valve covers. Some of the most popular models are the Skylark, LeSabre and Riviera. Buick hot rods are known for specific stylistic touches such as the Sweepspear, seen on the Riviera, and the