The Buick version of the 215 all used the same heads to my knowledge, I've never seen or heard otherwise. The Oldsmobile version is totally different, they had a few different sets. Keith
Is your block Buick or Olds. The Olds has an extra head bolt per cylinder. Count the bolt holes and make sure you get the right ones.
I have a Buick block. I read about the bolt count differences and have been paying attention. Thanks. I happen to have two A1 heads along with one A2X. I am wondering if I can use both A1’s or if I have to use an A1 and an A2X head combination. Does it matter?