Educate me please !!! LA info needed

Curiosity got the better of me. Measured this set of 234's and got 67.5cc, yes the seated surface (sunk) indicates multiple valve jobs. Even checked it again with different equipment. as is it's 67.5. The block, here's another 318 with the machine marks.100_2493.JPG 100_2498.JPG 100_2491.JPG