Did some more checking on these rods. They may be beefy but they are made out of inferior material compared to the Chevy's. Took a small ball peen and struck each one. The pontiac rod has a dull thud. The Chevy rod has a tool steel ring to it.
Inliner Member 1716 65 Chevelle Wagon and 41 Hudson Pickup Information and parts www.12bolt.com