So im goin to look at a 88 pathy tonight. the guy said the key for the lower timing sprocket rolled causing the timing to jump exactly 2 deg. he said he tore it apart and put it back in time and the truck idles fine, but the second you give it gas the key rolls again.. he said it probably could be welded back on and that would fix it?? I havent seen the truck yet so i dont know exactly what the key is doin but my question is if it jumped time 2 teeth on the belt do you think the valves could be bent? thanks