Yes they are that good OOTB. The set I have are up and running on my 410 stroker. Lash settings remain stable, I’ve got ample oil being delivered to both rocker assemblies, no head related issues or shortcomings seen to date. Pulling them out of the box and looking over the beautiful quality CNC work done there was no way in hell after paying next to $2000 for said quality that I was taking a grinder to them! Not that I’d know where to begin or have a way of verifying anything in the first place, or need the possible extra gains. And I sure as hell wasn’t going to fork out wads of cash to have someone trial and error things searching for more. I know I’m not in the minority regarding who’s buying these heads.
In general, There’s the street, street/strip guys and then the racers, hardcore racers. This is hardcore racer level stuff. BUT of interest to either nonetheless.
TF really needs to release a set of bare non-CNC heads for the many that are at this “level” of engine performance and competitiveness. But being this is all there is you work with what ya got. Interested in findings and results here as well.
Living vicariously in my case! :)