[PurelyGTO68]

Does anyone have any info to help identify the longer connecting rod in the photos? About 30 years ago I considered building a long rod 400 and was going to use these rods. I think I was told they are factory forged rods but I don't remember the details...(possibly a prototype rod?) The photos have a standard length aftermarket forged rod next to it for comparison sake. As best as I can measure, the old rod is about .450-.460" longer than stock. I wonder what the custom piston would look like in order to make this rod work in a 400 engine?

Do you recognize this rod?