After reading this post I looked at a pair of X heads I have saved for a later project and one is 2531894 E the other is 2531894 A . I presume E is 69 so what is A ? Can't be '65 . 340's didn't exist till late '67 for the '68 production. Any thoughts ??
Can u post a pic of the A. Maybe it’s like the 340s we’re only used in cars till 73. But I have seen 1977 year blocks. 340s were in boats and other equipment. And for warranty purposes. Kim