Since the introduction of, GM's LS/Gen IV engine has quickly become the ''preferred choice'' among many engine builders and performance enthusiasts. Right from the factory, the GM LS/Gen IV engine boasts a surprisingly efficient induction design, reduced weight and impressive power output. As the leading developer of high performance LS/Gen IV valve train technology, Comp Cams has engineered a full line of products proven to release the incredible horsepower and torque hidden inside while never sacrificing ever-critical reliability.