id bet my azz a 2.02 valve comes closer to 4.0 cylinder wall with a 23 degree head than it ever would in a 3.91 cylinder with 18 degree heads but you dont see chevy guys notching the cylinder bores,..shrouding is more of a myth than a reality!! alot of 23 degree chivvys use a 2.05 and 2.08 valves with no issues! it just ant needed in my opinion!
Well now dirty boy, you also do not see Chubby guys stuffing 2.05 or 2.08 valves in a 305 engine. Their just is no room. Now could they notch the bore for valve clearance and shrouding? Of course.
Being as you are a "shrouding doubter" mebe you is needin to get copies of David Visard's books; How to Port and Flow Test Cylinder Heads and How to Build Horse Power. It may be an idea to also watch some of his PowerTec videos. You may just learn sumat before ignorance hurts you.
