318 exhaust size

Thanks. I wonder if the Summit cams are ground by Crane?
I believe so..... or used to be. However, the lifter boxes said Elgin. I cannot complain at all, cam and lifters for 109.99. When I did that project, I had to keep it under 500 bucks, so that's why I picked that cam. That being said, I'm happy with it, especially for the price.