the ls/vtec is basically a 2G/3G RS,LS,GS Teg Motor. all the none vtec b18 motors are known today as an LS. I am sorry if i don't have the exact details on why everybody calls it an LS motor, but u will get use to it. ls/vtec is also known as a frankenstein motor. if u want more info, check up the 1st sticky, and look up ls/vtec. feel free to correct me, or just elaborate if felt necessary.