Originally Posted by Fab64
I've attached a curve graph that I found online a while back, but I cannot verify if this is an actual factory curve. Even if it is, they were pretty conservative. But, at least, it's a starting point. Good luck.

Roger

Try attaching again. Be curious to see what is out there.

I'll post one from the specs in the Plymouth FSM.
I've noticed that Dodge and Plymouth sometimes spec'd the initial slightly differently.