Performance Engine Components Dart Machinery is the undisputed leader in racing and performance cylinder heads and engine blocks. Whether your interest is in drag racing, circle track, off road, marine or street performance, Dart offers the very best in engine components to meet your needs. Dart's first products were the Hemi cylinder heads that first broke the 300mph barrier in Top Fuel and made the first pass in the 4 second range in Funny Car. Today, Dart produces cast iron and aluminum cylinder heads and blocks which set the standard in V8 performance around the world.