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.