The OS MAX-30VG engine is an exciting big block engine from world reknown OS. This engine has been rated by OS at 3.0HP @ 28,000RPM, but OS is known to rate their engines conservatively so the power of this engine should be impressive! This OS .30 engine is designed for use in .21 applications such as rc trucks, buggies, truggies, and anywhere someone wants extreme big block power. There will be 3 versions available of the OS MAX-30VG engine: OS MAX-30VG(P)-X pull start version, OS MAX-30VG(P) non-pull start version, OS MAX-30VG(P) SR Roto Start compatible version. OS is known for building some of the best engines in the world that are reliable, easy to tune, and very powerful.