The problem arises from the use of the term "six-pack rod". Not all 440's with the heavy rods were six-packs but the rods were the same as the '70-'72 six pack.
Understood. Thank you for the clarification. I've heard this information many times over the years but because I only have one personal experience to go by regarding these rods, it's always good Go back and confer with the guys who know.
