I'm building a bracket motor now that has .014 differences between the deck hieghts on both sides, .6 CC varience in the 8 combustion chambers and .004 differnences in the eight deck hieghts I'm putting a .051 thick head gasket on the +.010 deck hieght side and a .040 on the -.004 deck hieght side, I'm seeing right at .12 compression ratio differences in between all eight chambers and pistons set up that way Years ago I had 6.5 CC removed on my old 415 HP M.W NHRA stocker heads from one weekend to the next to make it right at the max allowed compression ratio and saw no measureable differences in ET or MPH I probally had other issues with that combination at that time also so maybe there is some gains to be had by absolute blueprinting to the Nth degree
I hope to make at least on perfect motor in my life time, at least Just one