ls/vtec is a mix of two motors that has good and bad sides to it. it is called an ls vtec because it has an ls bottom end from a ls gs or rs integra motor code b18b/a and a vtec head from a b16 or a b18c type r , gsr, and such. The good side to it is it gets more torque/hp than the normal set up but the bad side is some people think its not as reliable. If its done right then your good to go though.