Help, I've got a question for you guys. Did 68 large journal blocks use small journal main bolts? Machinist told me that ARP 123 5001 were wrong and that I need ARP 134 5002 (which is for small journal). I know they changed blocks up in 68 and that they changed from small to large journals (well actually medium if u count 400 sbc) from 67 to 68. They also changed blocks again in 69 with 350 and last yr for 327. Are all 68 blocks this way or could this have been left over main bolts they put in my motor? I just thought it was strange. Has anyone heard of this?