Originally Posted by
fastford
i was always curious why there was no evidence of core shift on the 307 blocks , an old man that helped me years ago loved the 307 block because of this , he bored them to a 350 and swore they were a lot better than a regular 350 block, i have 3 old 307 block stashed away and i looked at them a while back and the ring i was referring to earlier was even all the way around , i have 10 or so 010 350 blocks and only a few are like this....by the way , we have tested the ring thickness theory on the cylinders with a sonic tester and it holds true , if that surface is thinner on one side , the cylinders will be to. maybe those locating points you are talking about were not properly done and caused the core to be shifted on the milling machine,s......