Early A-Body Spitfire Headers
When I spoke with Harold, the changes he mentioned were simply to make some of the tubing a little larger for better flow. Specifically, I was told that he increased the size of the collecter tubing (where 2 tubes come together into one tube - that tube is now larger).
Does that make sense?
I have not installed them on my 64 yet. I am running an auto.
Thanks,
Clint S
San Gabriel