Cylinder Head Choice

@Curvedglass , thanks for that. The rear end squat is something to consider when your going beyond a certain level of for which I am unclear on. There is a fella running a black Dart super quick on leaf springs. Perhaps goggle “Worlds quickest lead spring car” for a result.
I think most people switch out long before that.

I don’t always subscribe to “What were supposed to do” very far. Sometimes it applies, sometimes it doesn’t. What anyone should do is be comfortable in how they do it.