I have a set of pistons I can't find any info on them. I know they're old, I've been carrying them around for 7 years after I pulled them out of an old 302 my cousin gave to me. I'm pretty sure they're TRW or Federal Mogul and they are .030 over pistons they have 1721P stamped on the top, they are domed. They look just like the old 2249 pistons from pictures I've seen on the net. The heads on the motor I pulled them out of were D80E. Can someone tell me info, what size rings, dome size or round about compression with 60-64cc heads, where can I buy new pins or will the ones I have be o.k. any info would really help. Thanks