This is true! Though I wouldn’t bother doing such work for a street or mild strip engine, these moves fall under the category of all the “Little Things” that add up in the search for HP and/or the edge in racing. Every little bit helps.
IIRC (again...going off my memory here...) at about .500 lift the valve/bore can be an issue IF the valve is big enough that it’s within .060ish of the bore.
Never forget there is core shift in the blocks. I’ve seen OE stuff off almost .030 and I’ve seen some guys offset the boring bar to “clean up” a cylinder that has damage or wear for whatever reason.
Makes for a long day if you are trying to install Oring grooves in the block. BTDT.
