NASCAR Nextel Cup Series
The NASCAR NEXTEL Cup Series is NASCAR's top racing series. The cars are rear-wheel-drive, high-powered, hot rods with a roll cage chassis and thin sheet metal covering, and are powered by V8 engines, with cast iron blocks, one camshaft and a pushrod valvetrain. However, significant engine development has allowed these engines to reach exceedingly high levels of power with essentially 1950s technology.