ProComp/Speedmaster aluminum heads

On plus side YR explanation rivals any of AJs long winded disortations.
As I always say to AJ, nut shell it and drop the math.
Get to the fuckin point! Skip the math lessons!
Thank you @yellow rose for condensing what I have type out over the long term/multiple posts to multiple posters.
This has been written about in many publications over the years. But sometimes you just have to re hash it again and again.

The best part is the “major limitation“ on math!