Sonic Testing ( LA Blocks )

Interesting, early 318 blocks 67-68, I HAVE personally seen bored to 4.040. I wouldn't do it though, there is more power in a STRAIGHT and STIFF wall than a thin one. I'm sure no one on this site will agree though, but I am correct.
Ten 4 !
Im just hoping my 68 or 70 block can safely go to 4.00 bore.