wow I did not know that there was a difference between 318/340 valve covers. now that I know I will be on the look out for them. I have a pair of 1970 340 covers and after looking at them I noticed that the pass side cover has that heat shield. the drivers side has a different style of oil filler cap. my question is.... are the pass covers identical from 69/70 as they appear to be to me. always eager to learn more about our hobby. thanks for your help