my Low dollar 318 hop-up project

joec said
Just a wild guess .... the magnums will make the same or a little better et than the sm heads. I didnt say hp i said et.

The magnums when compared to the LA heads will give more compression, bigger valves, bigger ports and 1.6 rocker arms. It's just win win win and win.
But when compared to the sm heads the sm is lighter and have bigger valves and ports.