I didn’t read the entire thread but maybe the guy is an asshole because of stuff just like this.
Clearly the OP is not an engine builder. He bought rockets he thought would bolt on. 99% of them do not, and the ones that do still need work.
I run 1.6 rockers and they didn’t fit either. Why? Because the heads were designed for 1.5 rockers. That means the pushrod tunnels and everything else is wrong for anything but a 1.5 rocker.
You not only need to clearance the tunnels for 1.6 rockers you need to correct the geometry.
That’s SOP.
So it’s not bad parts or customer service. It’s a guy that’s been in this business a long time. And he’s been dealing with guys who are unqualified to build engines trashing his parts.
This is on the OP.