um... it's nothing really hard.

sohc vtec motors in civic coupes/hatches/sedans/del sols since 92
dohc vtec motor in the civic si coupe was from 99-00
del sol's got the dohc vtec motor in like 95 96 and 97??? don't remember.

that's united states

jdm land had vtec in the crx's since 88.

first vtec equiped car sold in the states from honda was the acura nsx.

enjoy.