I'm working on a 327 for my "fourspeedwagon". It's a '67 small journal 327. I pulled a head off to inspect the cylinders and will probably put on a bigger set of heads I have. Anyway- the pistons are marked "B530" and then stamped either "90" or "06". I've never heard of a 90 over 327 and I've never seen one stamped 06 either. Usually I see .030 or similar. Anybody familiar with those pistons (b530)? They have about a 1/4 inch pop up and a slight eyebrow for the valves. I'll try to post a pic. Thanks in advance Well, scratch the pic.. I've been getting the same invalid file popup all week when trying to upload Isn't conforming to non-conformity still conforming?