318 LA rebuild after losing a valve seat

Thanks for catching that! Maybe dot to dot is a chevy thing?

And touching back on the springs, I'm concerned that stock springs would bind. The cam I have has .454/.475 lift, and when I tried the Comp 901 springs, they were binding at the machine shop when he was checking for installed height. I had to go with taller springs.

It wasn't the springs. The 901 is good to right at .500 lift. I bet the retainers were hitting the guides or "something else" was wrong. It was not the springs. Was he trying to set them up using the thick exhaust valve rotators?