Hi boatbob and welcome to iboats forum.<br /><br />Your 70hp is a 1977. These model numbers indicated the year.<br /><br />The site below will let you see it.<br /><br /> http://mitglied.lycos.de/old_omc/johnson.html
thanks a lot , i thought that was the case but being new to outboards i wasnt sure tried the introduces method but couldnt make it work. i am an auto tech. by trade and am learning that outboards are a different world.