I was looking in my old and weathered Direct connection speed secrets book yesterday, it talks about notching the cylinder walls on the LA V8s.Where, and how much to remove. It also says to do this to the 273 when running big valve heads, but for the rest of the LA line its not necessary.
The 273 is a 3.63" bore i think. I am going either .030 or .040 overbore on my teen. That would make it 3.940", or 3.950" overbore. There is a big difference. Plus a 360 is a 4.00" bore. I fail to see .025" really shrouding a 2.02 intake would be that bad. Plus unlike chivvy the valves are layed back at an 18° angle.
Like i said this guy is a very good machinest. The only guy i trust with my parts to be machined correctly. I just cant get him to wrap his head around this. Or to wrap his head around using the KB 167s. Something to do with em being cast.
I dont plan on running the snot out of this thing every time i drive it. Even the forged version of the kb167 should be fine. Not sure what the part number of this one is.