Not really, 68 69 were X heads 894 castings, 70 - 72 J heads 915, 70 & 71 340 had 915 2.02 1.60, 71-up 360 had 915 1.88 1.60, 72 340 had 1.88 1.60, 73 340 587 heads. I have seen chats that say different but over the years I have collected and sold many sets of heads off of 340's and this is what I have seen.
