MMR Billet Cam spacers (4V) These new Cam spacers are made from 6061 T-6 Aluminum and are hard anodized RED for strength, these cam spacers reduce important rotating weight by over 80% compared to the stock spacer but still retain the strength of the heavy factory spacers. They can be installed while the engine is in the car with simple hand tools and dyno testing has proven to add Quicker engine revving and response and HP by reducing parasitic drag/weight. 2 Included per kit. As used in the MMR 3000 Horsepower racecars! Perfect for street and race use.